Updated on 2022/09/22

写真a

 
NANBA Tokuro
 
Organization
Faculty of Environmental and Life Science Professor
Position
Professor
External link

Degree

  • Doctor of Engineering ( The University of Tokyo )

Research Interests

  • Inorganic Industrial Chemistry

  • 無機材料設計

  • 無機工業化学

  • Material Design of Inorganic Materials

Research Areas

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Nanotechnology/Materials / Inorganic materials and properties

  • Environmental Science/Agriculture Science / Environmental materials and recycle technology

  • Environmental Science/Agriculture Science / Environmental materials and recycle technology

  • Nanotechnology/Materials / Functional solid state chemistry

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Professional Memberships

 

Papers

  • Environmental activities on glass in Japan

    Tokuro Nanba, Yasuhiko Benino, Tomoko Akai

    Journal of the Ceramic Society of Japan   130 ( 8 )   605 - 610   2022.8

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    Publishing type:Research paper (scientific journal)   Publisher:Ceramic Society of Japan  

    DOI: 10.2109/jcersj2.22052

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  • Eco-Benign Orange-Hued Pigment Derived from Aluminum-Enriched Biogenous Iron Oxide Sheaths. International journal

    Katsunori Tamura, Yuri Oshima, Yuta Fuse, Noriyuki Nagaoka, Tatsuki Kunoh, Makoto Nakanishi, Tatsuo Fujii, Tokuro Nanba, Jun Takada

    ACS omega   7 ( 15 )   12795 - 12802   2022.4

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    Inorganic pigments have been widely used due to their low cost of production, strong hiding power, and chemical resistance; nevertheless, they have limited hue width and chromaticity. To eliminate these disadvantages, we herein propose the use of an ingenious biotemplate technique to produce Al-enriched biogenic iron oxide (BIOX) materials. Spectrophotometric color analysis showed that high levels of Al inclusion on heat-treated BIOX samples produced heightened yellowish hues and lightness. The Al-enriched BIOX sheaths exhibited a stable tubular structure and excellent thermal stability of color tones after heating at high temperatures and repetitive heat treatments. Ultrastructural analysis and mechanical destruction experiments revealed that the highly chromatic orange-hue of these pigments are ascribed probably to an ingenious cylindrical nanocomposite architecture composed of putative Fe-included low crystalline Al oxide regions and hematite particles embedded therein. The present work therefore demonstrates that the bioengineered material can serve as an epochal orange-hued inorganic pigment with low toxicity and marked thermostability that should meet large industrial demand.

    DOI: 10.1021/acsomega.1c07390

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  • Structural analyses and reverse Monte Carlo modeling of niobium oxide amorphous film prepared by sputtering method Reviewed

    Go Sajiki, Yasuhiko Benino, Chinatsu Oki, Koji Ohara, Hiroshi Okano, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 10 )   760 - 765   2017.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Structural analyses of niobium oxide (NbOx) amorphous film prepared with a sputtering method have been performed by using synchrotron X-ray radiation at SPring-8. The composition was determined as Nb2O5 center dot 0.8H(2)O from the measurements of Rutherford back scattering, X-ray fluorescence, X-ray absorption near edge structure, and thermal desorption spectroscopy. Structural information was obtained by extended X-ray absorption fine structure and high energy X-ray diffraction measurements. It was supposed from the experimental data that NbOx consisted of distorted NbOn polyhedra connected by corner-and edge-sharing. Structural models were constructed with reverse Monte Carlo (RMC) simulations. In the RMC models, the structural characteristics were successfully reproduced, and H atoms were, however, randomly distributed. Then, bond valence sum (BVS) constraint was introduced to the RMC simulation. As the results, narrower distribution in BVS was achieved for all the constituent atoms, and distinct OH bonds were effectively generated in the RMC model. (C) 2017 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.17053

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  • Investigation of electronic structure of amorphous niobium oxide based on the density functional theory calculation of crystalline niobium pentoxide polymorphs Reviewed

    Chinatsu Oki, Go Sajiki, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   124 ( 12 )   1221 - 1225   2016.12

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    Electronic structure of amorphous niobium oxide prepared by a sputtering method was investigated based on optical absorption and photoelectron spectroscopies. In the valence band photoelectron spectra, broad peaks without any characteristic components were observed. Then, theoretical calculations based on a density functional theory were performed to interpret the experimental spectra by using three Nb2O5 polymorphs. Among the polymorphs, M-phase with tetragonal structure showed better reproducibility than the other B- and R-phases with monoclinic structure. It was finally concluded that the amorphous niobium oxide had a similar electronic structure to M-Nb2O5, and it was supposed that the broad feature in the photoelectron spectra was due to the broad distribution of Nb-O bonds in NbO6 polyhedra, which was characteristic in M-Nb2O5. (C) 2016 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.16180

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  • Electrochemical and Photoelectrochemical Properties of Nano-Islands of Zinc and Niobium Oxides Deposited on Aluminum Thin Film by RF Magnetron Reactive Sputtering Reviewed

    G. Sajiki, Y. Benino, T. Nanba, H. Okano

    Materials Sciences and Applications   6   292 - 309   2015

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    DOI: 10.4236/msa.2015.64035

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  • Nano-micrometer-architectural acidic silica prepared from iron oxide of leptothrix ochracea origin Reviewed

    Hideki Hashimoto, Atsushi Itadani, Takayuki Kudoh, Satoshi Fukui, Yasushige Kuroda, Masaharu Seno, Yoshihiro Kusano, Yasunori Ikeda, Yasuhiko Benino, Tokuro Nanba, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    ACS Applied Materials and Interfaces   5 ( 11 )   5194 - 5200   2013.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    We prepared nano-micrometer-architectural acidic silica from a natural amorphous iron oxide with structural silicon which is a product of the iron-oxidizing bacterium Leptothrix ochracea. The starting material was heat-treated at 500 C in a H2 gas flow leading to segregation of α-Fe crystalline particles and then dissolved in 1 M hydrochloric acid to remove the α-Fe particles, giving a gray-colored precipitate. It was determined to be amorphous silica containing some amount of iron (Si/Fe = ∼60). The amorphous silica maintains the nano-microstructure of the starting material - ∼1-μm-diameter micrometer-tubules consisting of inner globular and outer fibrillar structures several tens of nanometer in size - and has many large pores which are most probably formed as a result of segregation of the α-Fe particles on the micrometer-tubule wall. The smallest particle size of the amorphous silica is ∼10 nm, and it has a large surface area of 550 m2/g with micropores (0.7 nm). By using pyridine vapor as a probe molecule to evaluate the active sites in the amorphous silica, we found that it has relatively strong Brønsted and Lewis acidic centers that do not desorb pyridine, even upon evacuation at 400 C. The acidity of this new silica material was confirmed through representative two catalytic reactions: ring-opening reaction and Friedel-Crafts-type reaction, both of which are known to require acid catalysts. © 2013 American Chemical Society.

    DOI: 10.1021/am401029r

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  • Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag Reviewed

    Kohei Omura, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    Journal of Asian Ceramic Societies   1 ( 1 )   108 - 113   2013

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    A chemical recycling process of inorganic wastes has been developed, where after vitrifying wastes, the glasses were heat-treated and soaked in an acid, obtaining colorless and transparent SiO2-abundant glasses. In the present study, distribution behavior of the constituents such as Si, P, Ti, Al and so on present in a municipal waste slag was examined. According to compositional analyses, the recovered solids after acid treatment consisted of SiO2, P2O5 and TiO2, suggesting the preferential distribution of P and Ti atoms into SiO2-rich phase during phase separation. In high resolution microscopic analyses, however, it was observed that P and Ti atoms were distributed separately from Si atoms, and they were present in the different particles insoluble in the acid. It was finally concluded that the insoluble solids were produced by a dissolution-reprecipitation process, that is, once all the constituents of the vitrified slag were dissolved in the acid, P2O5 and TiO2 coprecipitated as particles, and TiO2 was indispensable for the precipitation of P2O5. SiO2 also precipitated as particles separately from P- and Ti-containing particles. © 2013 The Ceramic Society of Japan and the Korean Ceramic Society.

    DOI: 10.1016/j.jascer.2013.03.003

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  • Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin Reviewed

    Hideki Hashimoto, Hiroshi Asaoka, Takuya Nakano, Yoshihiro Kusano, Hiromichi Ishihara, Yasunori Ikeda, Makoto Nakanishi, Tatsuo Fujii, Tadanori Yokoyama, Nanao Horiishi, Tokuro Nanba, Jun Takada

    DYES AND PIGMENTS   95 ( 3 )   639 - 643   2012.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100 degrees C in air for 2 h, vivid red-colored powdered materials including alpha-Fe2O3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as over-glaze enamels on porcelain. The precise color tone of the materials greatly depends on the heat-treatment temperature. The most strikingly beautiful sample, heat-treated at 800 degrees C, is light yellowish-red in color (L* = 47.3, a* = 34.1, and b* = 34.6), has a unique microstructure, and does not fade in color even with reheating at 800 degrees C, which is the firing temperature for over-glaze enamel on porcelain. The sample primarily consists of crystalline hematite particles similar to 40 nm in diameter with slightly longer axis unit-cell parameters than those of pure hematite. The particles are covered with amorphous silicate phase similar to 5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 mu m. The attractive color of this material is due to the following structural features: small particle size (similar to 40 nm). nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.dyepig.2012.06.024

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  • Amorphous structure of iron oxide of bacterial origin Reviewed

    Hideki Hashimoto, Tatsuo Fujii, Shinji Kohara, Hiroshi Asaoka, Yoshihiro Kusano, Yasunori Ikeda, Makoto Nakanishi, Yasuhiko Benino, Tokuro Nanba, Jun Takada

    MATERIALS CHEMISTRY AND PHYSICS   137 ( 2 )   571 - 575   2012.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    In nature, there are various iron oxides produced by the water-habitant bacterial group called "iron-oxidizing bacteria". These iron oxides have been studied mainly from biological and geochemical perspectives. Today, attempts are made to use such iron oxides as novel functional materials in several applications. However, their quantitative structural characteristics are still unclear. We studied the structure of iron oxide of microtubular form consisting of amorphous nanoparticles formed by an iron-oxidizing bacterium, Leptothrix ochracea, using a combination of high-energy X-ray diffraction and reverse Monte Carlo simulation. We found that its structure consists of a framework of corner- and edge-sharing distorted FeO6 octahedral units, while SiO4 tetrahedral units are isolated in the framework. The results reveal the atomic arrangement of iron oxide of bacterial origin, which is essential for investigating its potential as a functional material. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matchemphys.2012.10.002

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  • Effect of Nb2O5 addition to SnO-P2O5 glass Reviewed

    Satoshi Fukui, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   120 ( 1407 )   530 - 533   2012.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    SnO-P2O5 glasses have high refractive index and low glass transition temperature but have poor water durability. To improve water durability, NbO2.5 was added to SnO-P2O5 glasses, preparing SnO-NbO2.5-P2O5 glass. It was found that addition of only 4 mol % NbO2.5 was enough to achieve significant improvement of water durability, and at the same time, no degradation in thermal and optical properties was observed. (C)2012 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.120.530

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  • Surface crystallization of stoichiometric glass with Bi2ZnB2O7 crystal using ultrasonic surface treatment followed by heat treatment Reviewed

    Keita Kanenishi, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   120 ( 1407 )   509 - 512   2012.11

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    Surface crystallized glass-ceramics with nonlinear optical Bi2ZnB2O7 (BZB) crystals were prepared by ultrasonic surface treatment (UST) followed by crystallization heat treatment for stoichiometric glass with a composition of 33.3Bi(2)O(3)-33.3ZnO-33.3B(2)O(3). According to the surface XRD measurements and microscopic observations, UST technique was found to be quite effective for lower temperature precipitation of BZB, indicating the ability of crystallization control of the target phase, such as phase selectivity, small size of precipitates, high orientation and their morphology. After the optimization of the process condition parameters for improving transparency and suppressing deformation of the sample, the effective optical nonlinearity of the transparent surface crystallized glass-ceramics was estimated as 0.7 pm/V. (C)2012 The Ceramic Society of Japan. All sights reserved.

    DOI: 10.2109/jcersj2.120.509

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  • Effect of additives on the distribution of phosphorus associated with phase separation of borosilicate glasses Reviewed

    Yasuhiko Benino, Yuki Ohtsuki, Shinichi Sakida, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   120 ( 1407 )   490 - 493   2012.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Sodium borosilicate glasses containing phosphorus were prepared, and the effect of Al2O3 and TiO2 addition on the distribution behavior of phosphorus atoms associated with the phase separation was investigated. After heat treatment, a phase separation by the spinodal decomposition was commonly confirmed by SEM observation. In the additive-free sample, phosphorus was preferentially distributed into B2O3-rich phase after the phase separation, and after adding Al2O3 or TiO2, the amount of phosphorus distributed into SiO2-rich phase increased. It was also suggested that TiO2 had a stronger influence on the phosphorus distribution into SiO2-rich phase than Al2O3. P-31 MAS-NMR revealed that most of phosphorus atoms in the additive-free glass were present in PO4 units consisting of two terminal oxide ions, and the terminal oxide ions decreased and increased after the additions of Al2O3 and TiO2, respectively. It was suggested that this structural change brought about a change in the distribution of phosphorus. (C) 2012 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.120.490

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  • Prediction of glass structure by using multiple regression analysis Reviewed

    Kumiko Ishii, Toru Tsuneoka, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   120 ( 1399 )   98 - 103   2012.3

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    Multiple regression analyses were applied to the prediction of glass structures, such as O 1s binding energy and fraction of fourfold coordinated boron atoms, N-4. In the case of linear combination of the content of glass constituents, an acceptable prediction accuracy was obtained for O 1s binding energy, and as for N-4, however, a poor agreement was observed between the prediction and measurement. After introducing quadratic and cubic interaction terms into the regression formula, a drastic improvement was achieved in the prediction of N-4. Some regression coefficients were dependent on basicity of each glass constituent, suggesting the feasibility of prediction for the glasses containing novel constituents whose regression parameters have never been determined. (C)2012 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.120.98

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  • Fabrication and characterization of Er3+-doped tellurite glass Waveguides By Ag+-Na+ Ion-exchange Method Using a Dry Electromigration Process Reviewed

    S. Sakida, K. Kimura, Y. Benino, T. Nanba

    Processing, Properties, and Applications of Glass and Optical Materials: Ceramic Transactions   231   201 - 207   2012

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  • Functional and Structural Characterizations of Fresnoite Glass-Ceramics Oriented with UST Technique Reviewed

    Y. Benino, A. Endo, S. Sakida, T. Nanba

    Processing, Properties, and Applications of Glass and Optical Materials: Ceramic Transactions   231   161 - 165   2012

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  • Effect of TiO2 Addition on the Distribution of Phosphorus Associated with Phase Separation of Borosilicate Glasses Reviewed

    Y. Ohtsuki, S. Sakida, Y. Benino, T. Nanba

    Processing, Properties, and Applications of Glass and Optical Materials: Ceramic Transactions   231   145 - 149   2012

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  • Characterization of glasses based on basicity Invited Reviewed

    Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   119 ( 1394 )   720 - 725   2011.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Basicity is defined as an electron donating ability of a material, and hence, an oxide material containing oxide ions with high electron density is regarded to be in high basicity. It has been demonstrated that basicity can be evaluated by binding energy of core level electrons, which is measured by X-ray photoelectron spectroscopy. Based on the experimental results obtained from a large number of oxide glasses, correlations among basicity, O1s binding energy, structure and properties of glasses have been investigated. In the present paper, some of the research outcomes are introduced. (C)2011 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.119.720

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  • MgO-Al2O3スピネルの耐スラグ侵食性に及ぼすZrO2添加効果 Reviewed

    藤田基成, 北 基, 伊賀棒公一, 崎田真一, 紅野安彦, 難波徳郎, 三浦嘉也, 山口明良

    耐火物   63 ( 6 )   279 - 286   2011.6

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  • Effect of Addition of Non-oxides on the Slag Corrosion Resistance of MgO-Al2O3 Refractories Reviewed

    Keisuke Morita, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): INNOVATION IN REFRACTORIES AND TRADITIONAL CERAMICS   18   222015   2011

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    Various non-oxides, such as SiC, Si3N4 and AlN were added to MgO-Al2O3 refractory, and the effect on the slag corrosion resistance was investigated. The specimens were prepared by a spark plasma sintering (SPS) method. Slag corrosion tests were carried out using a button method under a reducing atmosphere. Improvement in corrosion resistance was confirmed for the SiC-added specimens, and the addition of nitrides, however, resulted in deterioration. Wettability was also examined, and the compositional dependence was not observed in contact angle. Quantitative relation was not found between contact angle and penetration depth.

    DOI: 10.1088/1757-899X/18/22/222015

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  • Fabrication and characterization of Er3+-doped tellurite glass waveguide by Ag+-Na+ ion-exchange method Reviewed

    K. Kimura, S. Sakida, Y. Benino, T. Nanba

    IOP Conference Series: Materials Science and Engineering   18 ( 8 )   112018   2011

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    The planar waveguides of 12Na2O10NbO2.525WO 353TeO2+1Er2O3 ([NbWEr]) glasses were prepared by Ag+-Na+ ion-exchange at 320-380°C for 5-30 h. The optical properties of the waveguides were characterized. Waveguiding property was successfully confirmed under all the ion-exchange conditions in this study. The thickness of the waveguides increased with increasing ion-exchange temperature and time. The minimum propagation loss of the waveguides was approximately 0.8 dB/cm at 632.8 nm. Hence, the [NbWEr] glass waveguides were considered to be promising for broadband optical amplifiers. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/11/112018

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  • Phase separation of borosilicate glass containing phosphorus Reviewed

    Y. Ohtsuki, S. Sakida, Y. Benino, T. Nanba

    IOP Conference Series: Materials Science and Engineering   18 ( 8 )   112022   2011

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    Sodium borosilicate glasses containing P2O5 and Al2O3 were prepared, and the behavior of phosphorus associated with the phase separation and the effect of Al2O 3 addition have been investigated. After the heat treatment, phase separation by spinodal decomposition was observed in the all samples. In the Al2O3-free glasses, phosphorus was preferentially distributed into B2O3-rich glass phase after the phase separation. With increasing Al2O3 content, the amount of phosphorus distributed into SiO2-rich glass phase increased. According to 31P MAS NMR measurements, in the Al2O 3-containing glasses, Q4 units free from terminal oxygen atoms were formed. It was suggested that the distribution of phosphorus depend on the PO4 units. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/11/112022

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  • Coloration and Depth Distribution of Cations Electrochemically-inserted into Electrochromic WO3 Thin Films Reviewed

    Miho Kawai, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS   18   092039   2011

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    Li+ and H+ ions were electrochemically inserted into amorphous WO3 films prepared on an ITO-coated glass substrate by an R. F. magnetron sputtering method under Ar/O-2 flow ratios of 4/1 (SP1) and 1/1 (SP2). The cation distribution was estimated indirectly by depth profiles of refractive-index obtained from prism coupler measurements and was evaluated directly by glow discharge spectrometry (GDS). H+ ions inserted were segregated only at deeper region around ITO electrode, which was independent to the preparing condition. In the case of Li+ insertion into SP1 film, Li+ ions were initially segregated at around ITO electrode, and after further insertions, they were also distributed at around the surface of WO3 film. In SP1 film, Li+ ions at around ITO electrode seemed to contribute to coloration. In SP2 film, however, Li+ ions subsequently inserted, which were uniformly distributed in the film, were only involved in coloration. The difference in depth distribution and coloration was due to the difference in atomic structure of WO3 films.

    DOI: 10.1088/1757-899X/18/9/092039

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  • Effect of ultrasonic surface treatment on the transparency and orientation of fresnoite surface crystallization Reviewed

    A. Endo, S. Sakida, Y. Benino, T. Nanba

    IOP Conference Series: Materials Science and Engineering   18 ( 8 )   112015   2011

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    Surface crystallized glass ceramics with fresnoite (Ba2TiSi 2O8) phase were prepared by conventional heat treatment of 30BaO-20TiO2-50SiO2 glass together with ultrasonic surface treatment (UST) technique. The precursor glass was fully crystallized in a bulk form without any cracks, and the optical transparency and crystallographic orientation of the crystalline layers were evaluated by UV-Vis spectroscopy and XRD diffraction analyses, respectively. These properties were both enhanced significantly by applying UST using fresnoite/water suspension before the crystallization process, which is advantage for nonlinear optical applications of bulk glass ceramics. The effects of UST on the crystallization behavior were investigated by applying UST with various conditions. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/11/112015

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  • Molecular dynamics simulation of lead borate and related glasses in multicomponent systems for low melting vitrification of nuclear wastes Reviewed

    S. Kato, S. Sakida, Y. Benino, T. Nanba

    IOP Conference Series: Materials Science and Engineering   18 ( 1 )   022014   2011

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    Glasses based on lead oxide have excellent properties in general such as low melting point, high chemical durability and high stability of glassy form, which are suitable for the preservation of volatile nuclear wastes in a permanent vitrified form. In order to confirm the long-term performance of lead borate based glasses it is necessary to establish dissolution and diffusion processes based on a reliable model of the glass structure. In the present study molecular dynamics (MD) simulation of lead borate based glasses was carried out introducing a dummy negative point charge to reproduce asymmetric PbO n units. Parameters for the dummy charge were optimized based on the comparison between calculated radial distribution function and experimental one. Asymmetric coordination around Pb, for example trigonal bipyramid, was successfully reproduced in the MD simulated binary and ternary glass models. The simple model using the dummy charge was confirmed to be valid for further simulations of multicomponent glasses containing nuclear wastes and heavy elements. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/2/022014

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  • Phase separation of borosilicate glass containing sulfur Reviewed

    Keiji Saiki, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   118 ( 1379 )   603 - 607   2010.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    A 10Na(2)S center dot 30B(2)O(3)center dot 60SiO(2) (mol %) glass was prepared, and the changes in glass structure and chemical state of sulfur caused by phase separation were investigated. In the as-prepared and heat-treated glasses, sulfur was present as S2- anion and polysulfide S2- and S3- anions, and Si-S and B-S bonds were not confirmed. A phase separation by spinodal decomposition was observed after heat-treatment, where sulfur was preferentially distributed to borate-rich phase. Even after the phase separation, formation of non-bridging oxygen was not recognized. The preferential distribution of sulfur anions in the present glass was explainable on the basis of the change in population of sodium ions, which compensated the negatively-charged sulfur anions. (C)2010 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.118.603

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  • FURTHER DEVELOPMENT OF IODINE IMMOBILIZATION TECHNIQUE BY LOW TEMPERATURE VITRIFICATION WITH BiPbO2I Reviewed

    Atsushi Mukunoki, Tamotsu Chiba, Yasuhiro Suzuki, Kenji Yamaguchi, Tomofumi Sakuragi, Tokuro Nanba

    PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT 2009, VOL 1   329 - 334   2010

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    The authors describe progress in the development of low temperature vitrification with BiPbO2I (BPI) as a promising immobilization technique by which Iodine-129 is recovered by BiPbO2NO3 to form BPI, and then solidified into a lead-boron-zinc glass matrix (PbO-B2O3-ZnO) using a low temperature vitrification process. The microscopic structure of BPI glass was analyzed by various analytical techniques, such as XRD (X-ray diffraction), NMR (nuclear magnetic resonance analysis), and XPS (X-ray photoelectron spectroscopy), using several types of glass samples. The results obtained provide structural information on key elements in BPI glass and can be applied for modeling the structure of the BPI glass, simulated by molecular dynamics. The previous work suggested that the leaching behavior of iodine from BPI glass depended upon the chemical conditions of the solution. Further leaching tests using solutions under varying conditions were carried out in order to predict mechanisms of iodine leaching. Normalized elemental mass loss values of iodine in simulated seawater and bentonite pore water are almost the same as those of boron, showing that iodine dissolves congruently with BPI glass, whereas iodine dissolves incongruently in Ca(OH)(2) solutions of pH 9 and 11. To demonstrate the feasibility of the BPI vitrification process, recovery tests of iodine from spent iodine filters were conducted and a prototype melting furnace was developed for scale-up tests of glass sample. It was found that more than 95% of iodine can be recovered from the spent iodine filter and that the prototype furnace can produce approximately 0.5 liters of homogeneous glass.

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  • Chemical recycling of municipal waste slag by using phase separation Reviewed

    Tokuro Nanba, Yutaro Kuroda, Shinichi Sakida, Yasuhiko Benino

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1371 )   1195 - 1198   2009.11

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    A chemical recycling method by using phase separation was applied to municipal waste slags. Glasses were prepared from incineration ash and ash-melted slag, where B2O3 was added to promote phase separation. The glasses were heat-treated at temperatures higher than their glass transition temperatures, and they were soaked in hydrochloric acid, leaching CaO, Fe2O3, K2O, and S. Transparent and colorless solids containing ca. 80 mass% of SiO2 were successfully obtained as residues. It was suggested that phase separation took place not in the heat-treatment but in the vitrification process, and further characterizations are however required to investigate the phenomena at microscopic levels in the recycling processes. (C) 2009 The Ceramic Society of Japan. All rights reserved.

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  • Molecular orbital calculation of the Si-29 NMR chemical shift in borosilicates: the effect of boron coordination to SiO4 units Reviewed

    T. Nanba, Y. Asano, Y. Benino, S. Sakida, Y. Miura

    PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B   50 ( 5 )   301 - 304   2009.10

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    Borosilicate cluster models were constructed, and the Si-21 NMR chemical shift was estimated by molecular orbital calculations. For Q(4) species (an SiO4 unit consisting of four bridging oxygen atoms), a higher frequency shift was confirmed due to the replacement of the surrounding SiO4 with BO4 units, and for Q(4) species associated with more than one BO4 unit, the chemical shifts were nearly identical to those for Q(3) species (an SiO4 unit including one nonbridging oxygen) in alkali silicates. The chemical shifts of Q(4) species in borosilicates were interpreted in terms of the change in bond angle of Si-O-(Si,B4) bridges. A change in chemical shift anisotropy of Q(4) species was also found. The Q(4) species associated with two BO4 units indicated an anisotropy maximum, which was smaller than the anisotropy of Q(3) species.

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  • Correlation between basicity and coordination structure in borosilicate glasses Reviewed

    Y. Tanaka, Y. Benino, T. Nanba, S. Sakida, Y. Miura

    PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B   50 ( 5 )   289 - 293   2009.10

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    Various quaternary borosilicate glasses in the general system M(2)O-M'O-Al(2)O(3)-B(2)O(3)SiO(2) (M=Li, Na or K; M'=Ca, Sr or Ba) were prepared, and the concentration of four-fold coordinated boron (B4) atoms was determined using (11)B magic angle spinning NMR. Regression analyses were performed to predict the B4 fraction, in which B4 fraction and glass basicity were used as dependent and independent variables, respectively. Except for Al(2)O(3)-containing glasses, regression formulae giving high correlation coefficients were successfully obtained by using B4/(B+Sixf) (where f is a tunable coefficient) as the dependent variable. As for the glasses containing Al(2)O(3), however, the necessity of a different dependent variable was indicated.

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  • Studies on the characterization of sulfur and coloration in borosilicate glasses Reviewed

    Taro Asahi, Susumu Nakayama, Tokuro Nanba, Hajime Kiyono, Hiroshi Yamashita, Takashi Mackawa

    JOURNAL OF CERAMIC PROCESSING RESEARCH   9 ( 4 )   401 - 406   2008.8

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    Ternary alkali borosilicate glasses containing sulfur were prepared by a conventional melt quenching method, and their chemical bonding states were investigated based on XPS and Si-29,B-II MAS-NMR measurement. The glass samples changed in color from blue to reddish brown due to the state of the sulfur and their glass compositions. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The forming of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, a signal from silicon atoms coordinated to the sulfur was detected in these glasses by the Si-29 MAS-NMR measurement. From these results, it is considered that sulfur atoms bonded silicon atoms at the forming range of the non-bridging oxygen component.

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  • Chemical recycling of inorganic wastes by using phase separation of glass Reviewed

    Tokuro Nanba, Shuhei Mikami, Takuya Imaoka, Shinichi Sakida, Yoshinari Miura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   116 ( 1350 )   220 - 223   2008.2

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    A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 Solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.

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  • Optical properties of Er3+-doped tungsten tellurite glass waveguides by Ag+-Na+ ion-exchange Reviewed

    Shinichi Sakida, Tokuro Nanba, Yoshinari Miura

    OPTICAL MATERIALS   30 ( 4 )   586 - 593   2007.12

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    The planar waveguides of 12Na(2)O center dot 35WO(3) center dot 53TeO(2) center dot 1Er(2)O(3) glass (in mol%) were prepared by Ag+-Na+ ion-exchange at 300-360 degrees C for 5-30 h. The effective mode indices and propagation losses of the waveguides were measured at the wavelengths of 473, 632.8, 983.1 and 1548 nm by means of a prism coupler technique. The waveguide depths from glass surface increased with increasing ion-exchange temperature and time. The diffusion parameters such as diffusion coefficient and activation energy were calculated on the basis of an Arrhenius temperature dependence of the diffusion coefficient of Ag+ ions in the ion-exchanged glasses. The propagation losses of the waveguides were 5.04-6.64, 2.70-4.77, 5.44-6.73 and 7.32-8.31 dB/cm in the first half in the propagation distance from 0 to 3.0 cm and 3.52-4.82, 1.92-2.99, 3.78-5.06 and 3.91-5.15 dB/cm in the latter half at 473, 632.8, 983.1 and 1548 nm, respectively. The relationship between the optical properties of the waveguides and the ion-exchange conditions is discussed. (c) 2007 Elsevier B.V. All rights reserved.

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  • Sintering of Al2O3-Cr2O3 powder prepared by sol-gel process Reviewed

    Motonari Fujita, Keisuke Inukai, Shinichi Sakida, Tokuro Nanba, Junji Ommyoji, Akira Yamaguchi, Yoshinari Miura

    Zairyo/Journal of the Society of Materials Science, Japan   56 ( 6 )   526 - 530   2007.6

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    The sol-gel method was applied to create Al2O 3-Cr2O3 ceramics using aluminum ethylacetoacetate diisopropylate and chromium (III) chloride hexahydrate as starting materials. In the calcination at 600-1200°C it was found that the grains of Cr2O3-rich solid solution grew when they were exposed to the surrounding Al2O3-rich amorphous particles. The composition of the powders obtained by the sol-gel process changed with calcining temperature. Cr2O3-rich solid solutions firstly crystallize at low temperature and the composition of the crystallites changes as the crystals grow and react with the surrounding Al2O 3-rich phases. The final sintered bodies fired under an Ar atmosphere showed higher relative densities as compared with those fired in air. A dense sintered body was not obtained when abnormal grains grew when calcining occurred. © 2007 The Society of Materials Science.

    DOI: 10.2472/jsms.56.526

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  • Refractive-index profiles and propagation losses of Er3+-doped tungsten tellurite glass waveguide by Ag+-Na+ ion-exchange Reviewed

    S. Sakida, T. Nanba, Y. Miura

    MATERIALS LETTERS   60 ( 28 )   3413 - 3415   2006.12

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    The planar waveguide of 12Na(2)O-35WO(3)(.)53TeO(2)lEr(2)O(3) glass (in mol%) was prepared by Ag+-Na+ ion-exchange at 330 degrees C for 5 h. The effective mode indices and propagation losses of the waveguide at the wavelengths of 473, 632.8, 983.1 and 1548 nin for TE and TM modes were measured by means of a prism coupler technique. The results were compared with those of a planar waveguide of the tungsten tellurite glass without Er3+ ions. Especially, the propagation losses of ion-exchanged tellurite glass waveguides were estimated for the first time to the best of our knowledge. (c) 2006 Elsevier B.V. All rights reserved.

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  • Structural change around Si atoms in P2O5-SiO2 binary glasses before and after annealing by Si-29 MAS NMR spectroscopy Reviewed

    Shinichi Sakida, Tokuro Nanba, Yoshinari Miura

    CHEMISTRY LETTERS   35 ( 11 )   1268 - 1269   2006.11

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    The Si-29 MAS NMR spectra of P2O5-SiO2 binary glasses were measured before and after annealing to examine the local structure around Si atoms in the glasses. The glasses were composed of SiO6 octahedra and Q(4) (SiO4 tetrahedra with four bridging oxygens). By increasing the P2O5 content, the fractions of SiO6 octahedra increased and those of Q4 decreased. The fractions of SiO6 octahedra increased by 6-8% in the range of 29.7 to 47.4 mol % P2O5 by annealing for 5 h. This result was found for the first time in binary glasses. On the basis of the results obtained, the local structure around Si atoms in the glasses and the structural change by annealing are discussed.

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  • Preparation of Na2S-B2O3-SiO2 Glass Systems and Local Structure Analysis Reviewed

    Taro ASAHI, Susumu NAKAYAMA, Yoshinari MIURA, Tokuro NANBA, Hiroshi YAMASHITA, Takashi MAEKAWA

    Journal of the Ceramic Society of Japan   114 ( 1332 )   697 - 704   2006.8

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    Ternary alkali borosilicate glasses containing sulfur were prepared by conventional melt quenching method, and their chemical bonding states were investigated based on X-ray Photoelectron Spectroscopy (XPS) and 29Si, 11B Magic Angle Spinning (MAS)-Nuclear Magnetic Resonance (NMR) measurement. The glass samples changed in color from blue to reddish brown due to the remaining sulfur and their glass compositions. These phenomena is closely related with the glass structure. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The formation of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, the signal of silicon atoms coordinated to the sulfur was detected in these glasses by the 29Si MAS-NMR measurement. From these results, it was considered that sulfur atoms bonded silicon atoms at the formation range of non-bridging oxygen component, and the bond of silicon to sulfur in the glasses caused the change in the sample coloration.

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  • Hardening mechanism of refractory patching materials with phosphate binder Reviewed

    Shinichi Sakida, Yuichi Yamamoto, Tokuro Nanba, Yoshinari Miura, Tetsuhiro Hayashi, Akira Yamaguchi

    Zairyo/Journal of the Society of Materials Science, Japan   55 ( 7 )   670 - 674   2006.7

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    The hardening mechanism of refractory patching materials with a phosphate binder was investigated by means of 31P static and magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Ten refractory patching materials were made of refractory powders of SiO 2 and fused alumina and five mixed solutions of phosphoric acid and aluminum biphosphate as phosphate binders. 31P static and MAS NMR spectra were measured of five phosphate binders and twenty soft and hard refractory patching materials, respectively, to reveal the local structure around P atoms. The 31P static and MAS NMR spectra revealed that PO 4 tetrahedra in the phosphate binders have no P-O-P linkage between PO 4 tetrahedra and that as the patching materials become hard, the ratio of PO 4 tetrahedra with bridging oxygens increases, respectively. This result suggests that the hardening of the patching materials is caused by the condensation of the phosphate binder. But the ratio of PO 4 tetrahedra with bridging oxygens was not enough to form the network by P-O-P linkage between PO 4 tetrahedra. On the basis of these results, the hardening mechanism of refractory patching materials with a phosphate binder is proposed.

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  • Consideration on the correlation between basicity of oxide glasses and O1s chemical shift in XPS Invited Reviewed

    T Nanba, Y Miura, S Sakida

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   113 ( 1313 )   44 - 50   2005.1

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    O1s binding energy measured by X-ray photoelectron spectroscopy (XPS) is candidate as a new tool to determine a new scale of Lewis basicity of oxide ions in glass. Some mathematical expressions for the basicity or XPS chemical shift, such as charge parameter and optical basicity, were compared with the experimental O1s binding energy in binary alkali oxide glasses. The expressions so far in use needed some modification in parameters. A new empirical expression introduced in this paper gives a new concept and universal scale of basicity.

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  • Molecular dynamic simulation on the structure of sodium germanate melts Reviewed

    T. Nanba, M. Nakamura, Y. Miura

    J. Ceram. Soc. Japan, Suppl.   112 ( 5 )   S1250 - S1253   2004

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  • A theoretical interpretation of the chemical shift of Si-29 NMR peaks in alkali borosilicate glasses Reviewed

    T Nanba, M Nishimura, Y Miura

    GEOCHIMICA ET COSMOCHIMICA ACTA   68 ( 24 )   5103 - 5111   2004

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    In Si-29-NMR, it has so far been accepted that the chemical shifts of Q(n) Species (SiO4 units containing n bridging oxygens) were equivalent between alkali borosilicate, and boron-free alkali silicate classes. In the sodium borosilicate glasses with low sodium content. however. a contradiction was confirmed in the estimation of alkali distributions B-11 NMR suggested that Na ions were entirely distributed to berate groups to form BO4 units, whereas a -90 ppm component Was also observed in Si-29-NMR spectra, which has been attributed to Q(3) species associated with a nonbridging oxygen (NBO). Then. cluster molecular orbital calculations were performed to interpret the -90 ppm component in the borosilicate, glasses. It Was found that a silicon atom which had two tetrahedral borons (B4) as its second nearest neighbors was similar in atomic charge and Si2p energy to the Q(3) species in boron-free alkali silicates. Unequal distribution of electrons in Si-O-B4 bridging bonds was also found. where much electrons Were localized oil the Si-O bonds. It was finally concluded that the Si-O-B4 bridges with narrow bond angle were responsible for the -90 ppm Si-29 component in the borosilicate glasses. There still remained another interpretation: the Q(3) species were actually present in the glasses. and NBOs in the Q(3) species were derived from the tricluster groups. such as (O3Si)O(BO3)(2). In the classes With low sodium content. however. it was concluded that the tricluster groups were not so abundant to contribute to the -90 ppm component. Copyright (C) 2004 Elsevier Ltd.

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  • Changes in atomic and electronic structures of amorphous WO3 films due to electrochemical ion insertion Reviewed

    T Nanba, M Ishikawa, Y Sakai, Y Miura

    THIN SOLID FILMS   445 ( 2 )   175 - 181   2003.12

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    The structural changes in amorphous WO3 films were investigated both on the atomic and electronic levels, and the experimental findings were interpreted using molecular orbital calculations. Electrochemical fast intercalation resulted in the splitting of a peak in the valence band region of the X-ray photoelectron spectrum. This splitting could be attributed to the formation of non-bridging oxygen. Decomposition Of WO6 units into WO4 units could also be inferred from the data. This decomposition was, however, not responsible for the split of the photoelectron peak. From the population analyses it was found that the average bond strength decreased due to the intercalation, while select W-O bonds increased in strength. It was expected that these changes in the chemical bonding character lead to localization of electrons and distortion of WO6 units, which was consistent with the theoretical interpretations of electrochromism, the intervalence charge transfer model and the small polaron absorption theory. (C) 2003 Elsevier B.V. All rights reserved.

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  • Alkali distribution in borosilicate glasses Reviewed

    T Nanba, Y Miura

    PHYSICS AND CHEMISTRY OF GLASSES   44 ( 3 )   244 - 248   2003.6

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    The alkali distribution in borosilicate glass has been discussed on the basis of the different quantities obtained by various experimental methods. The NBO fraction was chosen as a common quantity for evaluating the alkali distribution models. The NBO fractions in sodium borosilicate glasses were estimated from B-11 and Si-29 NMR as well as XPS. However, the best model was not found among the existing models. The amounts of sodium oxide consumed for the NBO formation in borate and silicate networks and for the formation of BO4 units were separately estimated from the B-11 and Si-29 NMR data. A new trend was found in the alkali distribution suggesting the possibility for a new universal distribution model.

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  • Chemical bonding state of sodium silicates Reviewed

    T Nanba, T Hagiwara, Y Miura

    ADVANCES IN QUANTUM CHEMISTRY, VOL 42   42   187 - 198   2003

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  • X-ray and neutron scattering study of the structure of lithium bismuth oxide glass Reviewed

    T Watanabe, T Nanba, Y Miura

    JOURNAL OF NON-CRYSTALLINE SOLIDS   297 ( 1 )   73 - 83   2002.1

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    The structure of (100 -lambda)Bi2O3 . xLi(2)O (25less than or equal toxless than or equal to35 mol%) glasses has been investigated by means of X-ray and neutron scattering methods. Comparing the glasses with several bismuthate crystals in total correlation function T(r), it is concluded that a large amount of edge-sharing BiOn polyhedra are present in the glasses and the network structure is similar to the Bi2O4 crystal. In the crystal, BiO6 octahedra form a layer sharing their four corners mutually, and the BiO4+4 distorted polyhedra are placed between the layers sharing all the edges with the neighboring polyhedra. Assuming two different Li sites in the Bi2O4-based structure, structural models were constructed to compare T(r), from which it was suggested that some Li ions substituted for the octahedral Bi site and some occupied an interstitial vacant site, In addition, the glasses have various defects such as excess 0 ions, positive-holes on 0 ions, vacant space to accept atmospheric oxygens, and Bi vacancies. The glass formation is sensitive to the melting conditions, such as temperature and period, suggesting that there exists some optimum quantity in the defect structures. (C) 2002 Elsevier Science B.V. All rights reserved.

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  • X-ray photoelectron spectroscopy of sodium borosilicate glasses Reviewed

    Y Miura, H Kusano, T Nanba, S Matsumoto

    JOURNAL OF NON-CRYSTALLINE SOLIDS   290 ( 1 )   1 - 14   2001.9

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    X-ray photoelectron spectra of RNa2O . B2O3 . KSiO2 (R = 0.2 to 5.0, K = 0.5 to 6.0) glasses were measured by a monochromatised Al-Ka XPS instrument. Chemical shifts of the core-level photoelectron spectra of the glass constituent ions were investigated. Peaks at the higher and lower energy sides of an Ols signal were ascribed to bridging oxide (BO) and non-bridging oxide (NBO) components, respectively. The BO component could not be separated into the oxide ions with different environment such as Si-O-Si, B-O-Si and B-O-B. Na1s signal could not be separated into two components of Na+ ions associated with [BO4/2](-) tetrahedron and NBO. For the small K values (=0.5 and 1.0), the NBO fractions measured by XPS agreed very well with the structural model proposed by Dell et al. [J. Non-Cryst. Soilds 58 (1983) 1], where NBO did not appear until R = 0.5 regardless of K values. With increasing K, however, the dependence of the NBO fraction upon R gradually came to disagree with the Dell model. At smaller R values than Rv = 0.5 +K/16, the NBO component already appeared to a considerable extent and the discrepancy between the XPS results and the Dell model became more significant with increasing K. This fact meant that additional sodium oxides were shared proportionally between silicate and borate networks even at the small R when K was larger than 2. A new sharing model was proposed on the basis of an acid-base concept. (C) 2001 Elsevier Science B.V. All rights reserved.

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  • Electron paramagnetic resonance study of positive-hole pairs on oxide ions in lithium bismuthate glass Reviewed

    T Watanabe, T Nanba, Y Miura

    CHEMISTRY LETTERS   ( 2 )   156 - 157   2001.2

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    The electron paramagnetic resonance signals attributed to the triplet state of the positive-hole pairs on oxide ions are observed in (100-x) Bi2O3. xLi(2)O glass (x = 25, 30, 35 mol%). So far as we know, this is the first experimental observation of the triplet oxygen hole center in oxide glasses.

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  • Molecular dynamic simulation on the structure of sodium germanate glasses Reviewed

    Tokuro Nanba, John Kieffer, Yoshinari Miura

    Journal of Non-Crystalline Solids   277 ( 2-3 )   188 - 206   2000.12

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    The structure of Na2O-GeO2 glasses has been investigated, using molecular dynamics (MD) simulations based on an empirical three-body interaction model. A multi-body potential function with two energy minima in the angular term for a given three-atom unit was introduced to permit a transformation between different coordination states, such as 4- and 6-fold coordinated Ge sites. Parameters in the potential function were optimized with a non-linear least-squares (NLS) method. The optimal parameter set obtained with a Na4Ge9O20 crystal was employed for the structural models of pure GeO2 and 2Na2O·9GeO2 glasses. In the model for the binary glass, however, a number of 5-fold coordinated Ge, non-bridging O and 3-fold coordinated O formed. Another binary model free from 5-fold Ge was prepared using a simple scheme in which no three-body interaction was applied to the structural units containing 5-fold coordinated Ge. All the structural models produced showed good agreement with the experiments, including vibrational spectra and radial distribution functions (RDFs). No significant difference between the experimental observables of the two binary glass models was revealed, except for the coordination environment of Ge. This is because 5- and 6-fold Ge do not occur in a discrete arrangement through a corner-sharing of GeO4, e.g. GeO5,6-GeO4-GeO5,6, but in a dense configuration, e.g. as edge-sharing GeO5,6-GeO5,6, forming smaller rings than those in pure GeO2 glass.

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  • X-ray photoelectron spectroscopy of sodium aluminosilicate glasses Reviewed

    Y Miura, S Matsumoto, T Nanba, T Akazawa

    PHYSICS AND CHEMISTRY OF GLASSES   41 ( 1 )   24 - 31   2000.2

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    X-ray photoelectron spectra of Na2O Al2O3-SiO2 glasses were measured by a monochromatised Al-k alpha XPS instrument with a novel charge control method Chemical shifts of cove level photoelectron spectra of the glass constituent ions were investigated with glass composition with respect to the external energy reference of Au 4f(7/2). Peaks at higher and lower energy sides of the Ols signal were observed and they were ascribed to bridging oxide (BO) and nonbridging oxide (NBO) components, respectively The BO component was successfully separated into two parts: Si-O Si (BO(1)) and Al-O-Si (BO(2)). The compositional change for the relative amount of the three O1s components follows an equation derived from an assumption that all aluminium ions were four-coordinated. The Na1s signal could not be separated into two components of Na+ ions associated with [AlO4/2](-) tetrahedra and NBOs. However, the Na1s chemical shift reflected the change in the bonding characteristics of Na+ ions in the glasses.

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  • Photoluminescence increase of Er3+ in Na2O-Nb2O5-SiO2 glasses after crystallization Reviewed

    ZD Yao, Y Ding, T Nanba, Y Miura

    JOURNAL OF NON-CRYSTALLINE SOLIDS   259   45 - 50   1999.11

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    Photoluminescence (PL) of Er3+ doped in xNaO(0.05)-xNbO(2.5)-(100 - 2x)SiO2 (mol%) (x = 24, 27, 30, 33, 36) glasses was investigated before and after crystallization. After crystallization, Er3+ was determined to be in the glass phase. Following the precipitation of the NaNbO3 crystalline phase in these glasses, PL intensity of S-4(3/2) --> I-4(15/2) transition of Er3+ increased. A maximum of >100-fold increment in the PL intensity was observed after crystallization as compared with that of the uncrystallized glass. The mechanism of augmentation of the PL intensity is discussed in terms of the theory of PL intensity. We assume that the difference in the refractive index between the residual glass and crystallized phases was a dominant factor causing the increase of the PL intensity after crystallization. (C) 1999 Elsevier Science B.V. All rights reserved.

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  • Oriented surface crystallization of lithium niobate on glass and second harmonic generation Reviewed

    Y Ding, Y Miura, S Nakaoka, T Nanba

    JOURNAL OF NON-CRYSTALLINE SOLIDS   259   132 - 138   1999.11

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    Surface crystallization of LiNbO3 on xK(2)O .(35-x)Li2O . 30Nb(2)O(5). 35SiO(2) (0 less than or equal to x less than or equal to 35) (mol%) glasses was investigated. The c-axis orientation of surface crystallized LiNbO3 was Improved when the glass contained 10 mol% K2O. Furthermore, Li ions in the LiNbO3 crystallites were partially replaced by K ions from the glass. Transparent surface crystallized LiNbO3 films on glasses were prepared by controlled heat treatment, which showed optical second harmonic generation. The estimated second-order non-linear optical susceptibilities were d(33) = 6.40 pm/V and d(31) = d(21) = d(34) = d(15) = 1/3d(33) = 2.14 pm/V for a film 1.33 mu m in thickness prepared after heating at 620 degrees C for 3 h, when the c-axis oriented film was described by a space group C-infinity v. (C) 1999 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0022-3093(99)00502-5

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  • Compositional dependences of Judd-Ofelt parameters of Er3+ in borosilicate glasses Reviewed

    Z Yao, Y Ding, T Nanba, Y Miura

    PHYSICS AND CHEMISTRY OF GLASSES   40 ( 4 )   179 - 183   1999.8

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    The compositional dependences of Judd-Ofelt intensity parameters Omega(t) with t=2,4,6 of Er3+ were investigated systematically in xN(n)2O .(40-x)B2O3. 60SiO(2). 0.25Er(2)O(3) (mol%) glasses. The value of Omega(2) reveals a maximum around 10 mol% Na2O, inconsistent with a maximum shown at a Na:B ratio of about I in some physical properties of sodium borosilicate glasses. Whereas those of Omega(4) and Omega(6), decrease monotonically, with increasing Na2O content. The compositional dependences of the intensity, parameters were also compared with those of silicate and borate glasses. It was found that the borosilicate glass compositions can be tailored to obtain those intensity parameter values in both silicate and borate glasses.

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  • Chemical Bonding State of Sulfur in Oxysulfide Glasses Reviewed

    T. Asahi, Y. Miura, T. Nanba, H. Yamashita

    The Korean Journal of Ceramics   5 ( 2 )   178 - 182   1999.2

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  • Local structure of Eu3+ in borosilicate glasses by phonon sideband spectra Reviewed

    ZD Yao, Y Ding, T Nanba, Y Miura

    MATERIALS SCIENCE RESEARCH INTERNATIONAL   4 ( 4 )   239 - 243   1998.12

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    InxNa(2)O . (40-x)B2O3 . 60SiO(2) (mol%) (x = 5,10,15,20,25,30) glasses with 0.25mol% Eu2O3 as additive, the local structure around Eu3+ was explored by employing the phonon sideband spectra of Eu3+ associated with the D-5(2) <--F-7(0), transition. It was found that the types and fraction of the structural units around Eu3+ varied with glass composition. Moreover, the B-O- vibrational mode of BO3 unit exists around Eu3+ when x ≤ 15, which is not present in the same composition glasses free of Eu3+. A greatest asymmetry in the surrounding, of Eu3+ occurs at x = 10, inconsistent with a maximum of some physical properties found in sodium. borosilicate glasses at a Na:B ratio of about unity. In addition, various structural units possess different coordination preference to Eu3+. The highest theoretical microscopic optical basicity on the oxygen atoms in these units was advocated as a criterion of the coordination preference, which successfully elucidated a series of coordination preference phenomena occurring in silicate, borate and borosilicate glasses.

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  • Photoluminescence enhancement of Er3+ in phase separated borosilicate glasses Reviewed

    ZD Yao, Y Ding, T Nanba, Y Miura

    MATERIALS SCIENCE RESEARCH INTERNATIONAL   4 ( 4 )   244 - 248   1998.12

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    Two sodium borosilicate glasses containing Er3+ were isothermally heat treated for phase separation, followed by the formation of the droplet and interconnected textures, respectively. The effects of heat treatment condition and the phase separated texture on photoluminescence (PL) intensity of S-4(3/2) --> I-4(15/2) transition of Er3+ were studied. It was found that the PL intensity increased with phase separation developing in both glasses. Moreover, the maximum PL intensities obtained by the phase separation in both glasses are 8.5 and 4.1 times as high as those in the respective untreated samples, the droplet texture being superior to the interconnected one. The mechanism of augmentation of the PL intensity was discussed in terms of the derived expression of the PL intensity. It was supposed that the induced interface after phase separation, causing notable increase in the radiative decay rate from the S-4(3/2) to I-4(15/2) levels, was responsible for the significant enhancement in the PL intensity.

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  • Intensified photoluminescence of EU3+ in the phase-separated borosilicate glass Reviewed

    Z Yao, Y Ding, T Nanba, Y Miura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   106 ( 11 )   1043 - 1047   1998.11

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    Eu3+ containing 3Na(2)O . 42B(2)O(3). 55SiO(2) (mol%) glass was isothermally heat-treated for phase separation. The photoluminescence (PL) behavior of Eu3+ was investigated. It was found that PL intensity of D-5(0)-->F-7(2) transition of Eu3+ increases with evolution of phase separation. A maximum 6.5 times increment in the PL intensity can be obtained after phase separation as compared to that of the as-cast sample. Moreover, the maximum increment of the PL intensity seems to be related to the texture induced by phase separation, the droplet texture being superior to the interconnected one. The mechanism of augmentation of the PL intensity was interpreted in terms of the derived expression of the PL intensity. It was then suggested that the induced interface after phase separation, causing remarkable increase in light scattering intensity and therefore notable increase in the population of Eu3+ On the D-5(0) energy level, accounted for significant enhancement in the PL intensity. On the other hand, from the emission intensity ratio of D-5(0)-->F-7(2) to D-5(0)-F-7(1) transitions of Eu3+, it was estimated that Eu3+ partitioned into the berate-rich phase after phase separation.

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  • Photoluminescence characteristics of Eu3+ doped in phase separated borosilicate glass Reviewed

    ZD Yao, Y Ding, T Nanba, Y Miura

    MATERIALS SCIENCE RESEARCH INTERNATIONAL   4 ( 3 )   141 - 147   1998.9

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    The 6NaO.31B(2)O(3).63SiO(2) (in mot%) glass was chosen. The photoluminescence(PL) characteristics of Eu3+ doped in the glass, which was subjected to different phase separated heat treatments, were investigated systematically, It was found that PL intensity of D-5(0)-->F-7(2) transition of Eu3+ increased with phase separation developing, Furthermore, the maximum PL intensities obtained by the different heat treatment processes seem to depend on the morphology induced by phase separation, the droplet morphology having the advantage over the interconnected one with the PL intensities of 6.4 and 5.5 times as high as that in the as-cast sample, respectively. The mechanism of enhancement of the PL intensity was then discussed on the basis of the derived expression of the PL intensity. It was concluded that the induced interface after phase separation, engendering significant increase in light scattering intensity and thereby notable increase in the population of Eu3+ on the D-5(0) energy level, accounted for considerable increase in the PL intensity. On the other hand, from the emission intensity ratio of the D-5(0)-->F-7(2) to D-5(0)-->F-7(1) transitions (R) of Eu3+, the phases into which Eu3+ segregated after various phase separation processes were estimated.

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  • X-ray photoelectron spectroscopy of alkali silicate glasses Reviewed

    S Matsumoto, T Nanba, Y Miura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   106 ( 4 )   415 - 421   1998.4

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    X-ray photoelectron spectra were measured on the fresh surfaces of silica, binary alkali silicate and mixed alkali silicate glasses fractured in ultra-high vacuum by irradiating with focusing monochromatic Al K alpha X-ray. Binding energies and chemical shifts of Ols, Si2p, Li1s, Na1s, K2p, Rb3d(5/2) and Cs4d(5/2) have been investigated, and charge densities of oxide, silicon and other alkali ions have been discussed. For xNa(2)O .(100-x)SiO2 glasses, electron densities of bridging oxide ion (BO), non-bridging oxide ion (NBO) and sodium ions increased with increasing the Na2O content, suggesting that the bond order between O2p and Na3s (or 3p) increased with increasing the Na2O content. In addition, the difference in binding energies between BO1s and NBO1s decreased with increasing Na2O content indicating that electrons were delocalized considerably in O2p-Si3d pi bonds, For 33.3R(2)O . 66.7SiO(2) (R = Li, Na, K, Rb, Cs) glasses, charge densities of BO increased with increasing ionic radius of alkali ions (Li-->Na-->K, Rb-->Cs). The degree of polarization of BO increased with increasing ionic radius of alkali ions, For 33.3 ((1-y)Li2O . yCs(2)O]. 66.7SiO(2) glasses, O1s peak of NBO could not been discriminated between the components belonging to Si-O-... Li+ and Si-O-... Cs+, Ols chemical shifts of 33.3((1-x)Li2O . xCs(2)O}. 66.7SiO(2) glasses with increasing Cs2O content were similar to the shifts of 33.3R(2)O.66.7SiO(2) glasses with increasing ionic radius of alkali ions. The area-weighed mean values of Ols peaks appeared to have good correlation with an empirical expression of optical basicity.

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  • Chemical Bonding State of Sulfur in Na_2S-SiO_2 Glasses

    ASAHI Taro, INO Takayuki, MIURA Yoshinari, NANBA Tokuro, YAMASHITA Hiroshi

    Journal of the Ceramic Society of Japan   106 ( 1230 )   150 - 154   1998.2

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    The structure and electronic states of Na_2S-SiO_2 oxysulfide glasses were investigated and the role of sulfur in the glasses is discussed. Na_2S formed stable glass with SiO_2 at an alkali concentration range similar to that of Na_2O-SiO_2 systems by the conventional melt-quench method. The obtained glasses were reddish brown in color and a remaining of sulfur was confirmed. X-ray photoelectron spectroscopy(XPS)was used to study the chemical bonding state of bridging and nonbridging anionic species in Na_2S-SiO_2 glass. The S2p binding energy of the glass was observed to be approximately 161 eV. This value is lower than that of orthorhombic crystalline sulfur and almost the same as the value of Na_2S. From the results, the electron density around sulfur was near to that of S^<2->. Furthermore, by ^<29>Si magic angle spinning(MAS)and unclear magnetic resonance(NMR)measurement, three clear-cut peaks were detected between 0 and -120 ppm. It was assumed that a sulfur atom was joined to silicon via substitution for an oxygen atom, and was present as nonbridging sulfur in Na_2S-SiO_2 glass with low alkali ion concentration. On the other hand, it was revealed that a portion of the sulfur ions existed in an isolated state from the glass-network structure at high alkali content. The glass composition changed to a chemical composition that was more silica rich than predicted. The sulfur ions made sulfide clusters with the sodium ions isolated from the glass-network.

    DOI: 10.2109/jcersj.106.150

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  • Chemical bonding state of sulfur in Na2S-SiO2 glasses Reviewed

    T Asahi, T Ino, Y Miura, T Nanba, H Yamashita

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   106 ( 2 )   150 - 154   1998.2

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    The structure anal electronic states of Na2S-SiO2 oxysulfide glasses were investigated and the role of sulfur in the glasses is discussed. Na2S formed stable glass with SiO2 at an alkali concentration range similar to that of Na2O-SiO2 systems by the conventional melt-quench method. The obtained glasses were reddish brown in color and a remaining of sulfur was confirmed. X-ray photoelectron spectroscopy (XPS) was used to study the chemical bonding state of bridging and nonbridging anionic species in Na2S-SiO2 glass. The S2p binding energy of the glass was observed to be approximately 161 eV, This value is lower than that of orthorhombic crystalline sulfur and almost the same as the value of Na2S. From the results, the electron density around sulfur was near to that of S2-. Furthermore, by Si-29 magic angle spinning (MAS) and nuclear magnetic resonance (NMR) measurement, three clear-cut peal-rs were detected between 0 and -120 ppm. It was assumed that a sulfur atom was joined to silicon via substitution for an oxygen atom, and was present as nonbridging sulfur in Na2S-SiO2, glass with low alkali ion concentration. On the other hand, it was revealed that a portion of the sulfur ions existed in an isolated state from the glass-network structure at high alkali content. The glass composition changed to a chemical composition that was more silica rich than predicted. The sulfur ions made sulfide clusters with the sodium ions isolated from the glass-network.

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  • Wavelet analysis of x-ray diffraction pattern for glass structures Reviewed

    Yong Ding, Tokuro Nanba, Yoshinari Miura

    Physical Review B - Condensed Matter and Materials Physics   58 ( 21 )   14279 - 14287   1998

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    A wavelet analysis of x-ray diffraction patterns is introduced for analyzing glass structures. The analysis indicates that within a short distance (∼0.8 nm for silica glass) atoms in the glass are arranged around the most probable positions which are almost as regular as the equilibrium positions in crystal. However, in glass the atomic distribution around the most probable position increases exponentially with increasing interatomic distance (exponentially damped regularity), whereas the crystal does not have this kind of damping. Beyond this distance, it is difficult to determine the structure in atomic scale due to the large atomic distribution. But, the analysis shows that the arrangement of quasiatomic planes in glass is still statistically regular (with damped regularity) up to an intermediate distance, e.g., 2.5-3.0 nm for silica glass. Then glass structure might be quantitatively determined by means of the structure of corresponding crystals and of the extent of the distributions around the most probable positions for atoms, as well as of the sizes of the structurally correlated group. © 1998 The American Physical Society.

    DOI: 10.1103/PhysRevB.58.14279

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  • Frequency doubling in gallium-lanthanum-sulphide glass with surface crystallized Ga6La10/3S14 thin films Reviewed

    Yong Ding, Atsuhiro Kondoh, Yoshinari Miura, Tokuro Nanba

    Applied Physics Letters   73 ( 6 )   738 - 740   1998

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    The reason for the optical frequency doubling in the 70Ga2S3-30La2S3 glass is investigated. The tetragonal Ga6La10/3S14 phase due to crystallization of the glass is responsible for the frequency doubling. Dense and transparent Ga6La10/3S14 crystalline thin films have been prepared by means of the controlled surface treatment of the glass due to an ultrasonic surface treatment. The effective second-order nonlinear optical susceptibilities of the crystalline thin films are analyzed. © 1998 American Institute of Physics.

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  • Wavelet structural analysis of silica glasses manufactured by different methods Reviewed

    Y Ding, T Nanba, Y Miura, A Osaka

    JOURNAL OF NON-CRYSTALLINE SOLIDS   222   50 - 58   1997.12

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    Wavelet analysis of X-ray diffraction patterns was made for structures of silica glasses manufactured by electrical fusion, oxy-hydrogen flame fusion of quartz powder, and flame hydrolysis of SiCl4. The analysis indicates that their structures were not affected by the manufacture methods. It is believed that there is a thermodynamically most favoured or unique structure for glass in an intermediate range up to a few nm. It is expected that amorphography (in analogy to crystallography for crystal) for glass will emerge as a new branch of science. According to our statistical crystallite model, glass structure could be determined by the crystallography of corresponding crystals and the damping with interatomic distance for the crystalline regularity. (C) 1997 Elsevier Science B.V.

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  • Preparation and Properties of the ZrO_2-Dispersed MgO-Al_2O_3 Ceramics(Part 3) : Influence of MgO-Al_2O_3 Composition

    TSUBOI Hiroyuki, YOSHIMATSU Hideyuki, NANBA Tokuro, MIURA Yoshinari

    Journal of the Ceramic Society of Japan   105 ( 1223 )   588 - 594   1997.7

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    ZrO_2-dispersed MgO-Al_2O_3 ceramics with various MgO to Al_2O_3 compositional ratios were prepared from Mg(OH)_2 powder, α-Al_2O_3 powder and Zr-n-butoxide by calcining at 1000°C for 2h and sintering at 1600°C for 1h. The influence of the MgO-Al_2O_3 compositional ratio on the sinterability and mechanical properties was studied. Addition of 10 vol% ZrO_2 improved the relative density of the sintered specimens containing 50 and 62.5 mol% Al_2O_3. However, the addition was not effective at other compositional ratios. The bending strength was improved at composition containing more than 50 mol% Al_2O_3, Where the dispersed ZrO_2 Particles were in the form of tetragonal phase. The bending strength increased with increase in Al_2O_3 content in the ZrO_2 dispersed specimens. The fracture toughness was improved for all specimens by ZrO_2 dispersion, especially, for the specimen in which MgO-Al_2O_3 component was in a single crystalline phase.

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  • Preparation and properties of the ZrO2-dispersed MgO-Al2O3 ceramics .3. Influence of MgO-Al2O3 composition Reviewed

    H Tsuboi, H Yoshimatsu, T Nanba, Y Miura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   105 ( 7 )   588 - 594   1997.7

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    ZrO2-dispersed MgO-Al2O3 ceramics with various MgO to Al2O3 compositional ratios were prepared from Mg(OH)(2) powder, alpha Al2O3 powder and Zr-n-butoxide by calcining at 1000 degrees C for 2h and sintering at 1600 degrees C for 1h. The influence of the MgO-Al2O3 compositional ratio on the sinterability and mechanical properties was studied. Addition of 10 vol% ZrO2 improved the relative density of the sintered specimens containing 50 and 62.5 mol% Al2O3. However, the addition tvas not effective at other compositional ratios. The bending strength was improved at composition containing more than 50 mol% Al2O3, where the dispersed ZrO2 particles were in the form of tetragonal phase. The bending strength increased with increase in Al2O3 content in the ZrO2 dispersed specimens. The fracture toughness was improved for all specimens by ZrO2 dispersion, especially, for the specimen in which MgO-Al2O3 component was in a single crystalline phase.

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  • Photochromic properties in cadmium bismuth aluminate glasses and its oxidation treatment effect Reviewed

    DP Chen, Y Miura, Y Murata, T Nanba, A Osaka

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   105 ( 4 )   322 - 328   1997.4

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    Photochromic properties were investigated for glass in the system CdO-Bi2O3-Al2O3. Optical density increased with increasing BiO1.5 content in the glasses at fixed CdO content. The darkening degree could be effectively enhanced by oxidation treatments. The composition dependence and effect of oxidation treatment were studied by X-ray photoelectron and Raman scattering spectroscopies. With increasing BiO1.5 content the Lewis basicity of oxygen atoms increased and the fraction of covalently bonded cadmium decreased. The trap density of holes increased and the photogeneration yield decreased. The darkening degree showed a maximum around BiO1.5=13 cation%. The effect of oxidation treatment on the darkening degree may be related to production of a large amount of monovalent O- ions with holes in their 2p valence band, and to formation of electron centers in cadmium atoms.

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  • X-ray photoelectron spectroscopy of alkali tellurite glasses Reviewed

    Y. Himei, Y. Miura, T. Nanba, A. Osaka

    Journal of Non-Crystalline Solids   211 ( 1-2 )   64 - 71   1997

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    X-ray photoelectron spectra of R2O-TeO2 (R: Li, Na, K, Rb and Cs) glasses were measured, using a fresh surface fractured in an ultra high vacuum (≈ 7 × 10-8 Pa) and irradiated with a monochromatic Al K α X-ray (hv = 1486.6 eV). The O 1s photoelectron spectra showed only a single Gaussian-Lorentzian peak and the peak shifted toward smaller binding energy with increase in Lewis basicity of oxide ions in the glasses. Two peaks attributed to BO and NBO were not observed. In the near valence band spectra for the lithium tellurite glasses, the spectral profile gradually became similar to that of a Li2TeO3 crystal with increase in Li2O content up to 30 mol% Li2O. This variation of the profile is correlated to the change in the coordination structure of the tellurium atoms (TeO4 trigonal bipyramids → TeO3 trigonal pyramids) with the addition of the alkali oxides.

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  • Color Change of Glass and Glass-Ceramics in Bi_2O_3-CdO-Al_2O_3 System(Special Issue on Ceramics)

    CHEN Danping, MIURA Yoshinari, NANBA Tokuro, MURATA Yasuaki, OSAKA Akiyoshi

    Journal of the Society of Materials Science, Japan   45 ( 6 )   630 - 636   1996.6

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    Color change and its mechanisms for glasses and glass-ceramics in the Bi_2O_3-CdO-Al_2O_3 system prepared under various melting and annealing conditions were investigated. It was suggested that brown color of the glasses with comparatively low Bi content which were obtained by melting at high temperatures was caused by metallic Bi while deep green color of the glasses with comparatively high Bi content resulted from Bi^<2+> and defects. The deep color of the glasses markedly faded after annealing treatments for long time. Formation of the transparent glass-ceramics was assumed to be related to the oxygen defects. Color of the glass-ceramics was explained in term of oxygen defects and crystalline phases formed by annealing treatments.

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  • Thermochromism and temperature dependence of the energy gap in cadmium aluminum bismuthate glasses Reviewed

    DP Chen, Y Miura, T Nanba, A Osaka

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   104 ( 2 )   79 - 83   1996.2

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    Reversible thermochromic coloration was detected in Bi0(1.5)-CdO-AlO1.5 system glasses. The relevant parameters were strongly dependent on the BiO1.5 content. It was suggested that the weakened and more polarized Bi-O bond due to increased BiO1.5 content enhanced the thermochromism of the glasses. The redshift of absorption edges at room temperature and the increase in the temperature coefficient of the shift with increasing BiO1.5 content were analyzed. The thermochromic mechanism was explained in terms of the temperature dependence of the optical energy gap caused mainly by electron-phonon interaction.

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  • X-RAY-DIFFRACTION STUDY ON THE FRAMEWORK STRUCTURE OF AMORPHOUS TUNGSTEN TRIOXIDE FILMS Reviewed

    T NANBA, T TAKAHASHI, S TAKANO, J TAKADA, A OSAKA, Y MIURA, T KUDO, YASUI, I

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   103 ( 3 )   222 - 229   1995.3

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    Amorphous tungsten trioxide films were prepared from iso-polytungstic acid as a precursor and by RF magnetron sputtering method. Framework structure was investigated based on X-ray diffraction analyses, in which amplitude function as well as radial distribution function was used, And the previously reported films prepared by vacuum evaporation and an ion exchange method using Na2WO4 . 2H(2)O as a precursor were also re-examined. It was found that, in the films derived from iso-polytungstic acid, the framework had a similar manner to that in hexagonal-WO3 crystal, whose framework was constructed by 3-, 4- and 6-membered rings formed by WO6 octahedra. It was supposed that edge-sharing polyhedra and tungsten and/or WO6 defects were present in the as-prepared film and changed to corner-sharing connection and continuous framework by post-annealing. It was also suggested that structural water was present in a hexagonal tunnel in the framework. These structural characteristics were also observed in the films prepared by vacuum evaporation and ion exchange methods. As for the sputtered films, formation of two framework-types without structural water was confirmed. The hexagonal-WO3 like framework was formed in the films prepared under a low O-2 partial pressure, and tetragonal-WO3 like one with an ordinary ReO3-type structure made up with 4-membered rings was produced at a high O-2 pressure.

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  • Characterization of amorphous tungsten trioxide thin films prepared by rf magnetron sputtering method Reviewed

    Tokuro Nanba, Tadashi Takahashi, Jun Takada, Akiyoshi Osaka, Yoshinari Miura, Itaru Yasui, Akira Kishimoto, Tetsuichi Kudo

    Journal of Non-Crystalline Solids   178 ( C )   233 - 237   1994.11

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    Amorphous tungsten trioxide thin films were prepared using a rf magnetron sputtering method. The relation between structure and electrochromic properties was investigated. At the macroscopic level, the films had dense structures. From Raman spectroscopic and X-ray radial distribution analyses, it was deduced that the networks were basically formed by three-, four- and six-membered rings of corner-sharing WO6 octahedra, and in the films with low O/W atomic ratios many edge-sharing units were present. It was also found that the films with high O/W ratios showed good electrochromic properties, which were closely related to the six-membered rings. © 1994.

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  • Computer simulation on the structure and vibrational spectra in GePbOF glass Reviewed

    Tokuro Nanba, Takahiro Miyaji, Jun Takada, Akiyoshi Osaka, Yoshinari Miura, Itaru Yasui

    Journal of Non-Crystalline Solids   177 ( C )   131 - 136   1994.11

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    Oxy-fluoride glasses in the GeO2PbOPbF2 system were prepared and their structure investigated using vibrational spectra, X-ray diffraction and Raman spectra methods. Structural models were constructed by molecular dynamics simulations. In the models obtained, glass networks were formed by GeO4 tetrahedra and Ge(O,F)5 and Ge(O,F)6 polyhedra. Lead entered the networks at PbFPb in the models with high Pb/Ge ratio. The presence of germanium with high coordination numbers of 5 and 6 was supported by radial distribution analyses. GeO bonds in GeO4 tetrahedra seemed to give bands between 650 and 850 cm-1 (non-bridging oxygen) and between 450 and 650, and between 850 and 950 cm-1 (bridging oxygen). GeO and GeF in Ge(O,F)n (n &gt
    4) were supposed to contribute the bands observed between 350 and 550 cm-1 in the Raman spectra. © 1994.

    DOI: 10.1016/0022-3093(94)90522-3

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  • PHOTOCHROMIC PROPERTIES OF CD-CONTAINING GLASSES Reviewed

    Y MIURA, J FU, A OSAKA, T NANBA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   178   64 - 68   1994.11

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    New photochromic glasses in the system Al-Cd-O-F, Al-Cd-Pb-O-F and Al-Cd-Pb-O were obtained. Al-27 nuclear magnetic resonance spectra confirmed that both Al(4) tetrahedra and Al(6) octahedra coexisted in the glasses containing fluoride ions and the number of the latter increased, accompanied by an increase of the fraction of Al-F bonds, with increasing atomic ratio F/O. However, most fluorine is coordinated with the Al(6) octahedra. Photo-induced absorption decayed slowly, accompanied by luminescence, and its half-life period was about 10 h at room temperature in the dark. The possible color centers are discussed on the basis of electron spin resonance spectra.

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  • COORDINATION CHANGE OF TE ATOMS IN BINARY TELLURITE GLASSES Reviewed

    Y HIMEI, A OSAKA, T NANBA, Y MIURA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   177   164 - 169   1994.11

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    Coordination changes of Te(+IV) atoms were derived from Raman and X-ray photoelectron spectra of the binary tellurite glasses containing Li, Na, Ba and Zn. A structure model consistent with the experimental results was proposed. In this model, TeO4 units were converted mainly to O2/2Te-O and O1/2Te(=O)-O- in the range of lower atomic ratio O/Te, and the rate of increase of TeO3/TeO4 decreased in the range of higher O/Te because of the equilibrium TeO4/2 &lt;-&gt; O2/2Te=O. The increase in the fraction of non-bridging oxygen atoms and three-coordinated Te(+IV) atoms was confirmed by X-ray photoelectron spectra. The fraction of non-bridging oxygen estimated from X-ray photoelectron spectra agreed well with that from the Raman spectra and the model.

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  • CDTE MICROCRYSTALLITES DOPED IN MELT-QUENCHED BOROSILICATE GLASS Reviewed

    J FU, A OSAKA, T NANBA, Y MIURA

    JOURNAL OF MATERIALS RESEARCH   9 ( 2 )   493 - 497   1994.2

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    CdTe microcrystallites were precipitated in 57.8CdO 19.7SiO(2) 19.OB2O3 3.5Al(2)O(3) glasses doped with 5.0 mol% CdTe. The microcrystallite size increased linearly with t(1/3) (t: heat-treatment time), indicating diffusion-controlled growth mechanism, where the estimated activation energy for diffusion was 542 kJ/mol. The linear increase in the band gap energy with 1/r(2) (r: the crystallite radius) suggested the quantum size effect of the CdTe microcrystallites.

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  • Enhanced Surface Crystallization of Chromium(III)-Doped Lithium Lanthanum Borate Glasses due to Ultrasonic Treatment Reviewed

    Yong Ding, Yoshinari Miura, Tokuro Nanba, Akiyoshi Osaka

    Journal of the Society of Materials Science, Japan   43 ( 489 )   618 - 623   1994

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    Precipitation of LaBO3 on the surface of a glass of composition 0.1Cr2O3·25Li2O·10La2O3·65B2O3 (in mol%) was enhanced due to ultrasonic surface treatment (UST) with aqueous and ethanol suspensions of LaBO3 particles. The aqueous suspension gave a higher efficiency than the ethanol suspension. The crystallites were almost uniform in size distribution, and grew irregularly: increase-decrease-increase in size when heated at 580°C. Preferred growth of (200) was detected. The mechanism of UST enhanced crystallization is proposed. © 1994, The Society of Materials Science, Japan. All rights reserved.

    DOI: 10.2472/jsms.43.618

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  • LOCAL-STRUCTURE AROUND ALUMINUM IN THE GLASSES OF THE SYSTEM AL2O3-PBO-CDO Reviewed

    J FU, A OSAKA, T NANBA, Y MIURA

    JOURNAL OF MATERIALS SCIENCE LETTERS   12 ( 12 )   935 - 938   1993.6

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  • Photochromic Glasses in the System SrO-ZnO-Al_2O_3

    FU Jie, OSAKA Akiyoshi, NANBA Tokuro, MIURA Yoshinari

    Journal of the Ceramic Society of Japan   101 ( 1169 )   99 - 101   1993.1

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    New aluminate glasses were obtained with the conventional melt-quench technique in the system SrO-ZnO-Al_2O_3. The glass forming region was determined. The glasses were colorless and had good chemical durability in laboratory conditions. When irradiated with UV-light, a broad absorption was induced with a peak at 470 nm (2.64 eV) and an ESR signal (77 K and 300 K) was induced with an apparent g-value of 2.006. Both the changes in optical density and the intensity of the ESR signal increased with the ZnO content. From the characteristic of ESR signal, coloring of glass was concluded to be due to the formation of hole trapped on oxygen and electron center resting on zinc ions.

    DOI: 10.2109/jcersj.101.99

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  • PHOTOCHROMIC-GLASSES IN THE SYSTEM SRO-ZNO-AL2O3 Reviewed

    J FU, A OSAKA, T NANBA, Y MIURA

    Journal of the Ceramic Society of Japan   101 ( 1 )   99 - 101   1993.1

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    New aluminate glasses were obtained with the conventional melt-quench technique in the system SrO-ZnO-Al2O3. The glass forming region was determined. The glasses were colorless and had good chemical durability in laboratory conditions. When irradiated with UV-light, a broad absorption was induced with a peak at 470 nm (2.64 eV) and an ESR signal (77 K and 300 K) was induced with an apparent g-value of 2.006. Both the changes in optical density and the intensity of the ESR signal increased with the ZnO content. From the characteristic of ESR signal, coloring of glass was concluded to be due to the formation of hole trapped on oxygen and electron center resting on zinc ions.

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  • Raman Spectra and Constitution of Binary Tellurite Glasses Containing Typical Network Modifying Cations Reviewed

    Akiyoshi Osaka, Jianrong Qiu, Tatsuo Fujii, Tokuro Nanba, Jun Takada, Yoshinari Miura

    Journal of the Society of Materials Science, Japan   42 ( 476 )   473 - 477   1993

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    The 720 and 780 cm-1 components of the deconvoluted Raman spectra of glasses in the systems RnO-TeO2 (R=Li, Na, K, Ba, Zn) were attributed to TeO3 groups and the 665 cm-1 band was to TeO4 groups. The theoretical values of the molar ratio TeO3/TeO4 derived from an assumed vitrification reaction were compared with the ratio derived from the intensity ratios of the Raman bands, I(720) /I(665) and I(780)/I(665). It was indicated that [O2/2Te=O] and [O1/2Te(=O)-O]- units were induced by the addition of network modifying oxides in the composition range of lower atomic ratio O/Te. It was proposed that the decrease in the rate of increase of the ratio TeO3/TeO4 in the range of larger O/Te was due to the equilibrium TeO4/2↔[O12/2Te=O] favoring the former unit. © 1993, The Society of Materials Science, Japan. All rights reserved.

    DOI: 10.2472/jsms.42.473

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  • The Formation of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O in Samples Enclosed in Silver Pipe.

    Egi Toshio, Hosotani Katsunori, Nanba Tokuro, Takada Jun

    J. Jpn. Soc. Powder Powder Metallurgy   40 ( 2 )   216 - 219   1993

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    The formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system has been studied in ground powder samples enclosed in silver pipes.The samples with a composition of Bi:Pb:Sr:Ca:Cu=0.9:0.2:1.0:1.0:1.6 prepared by heating at 850°C for 24h were mechanically ground for various periods, put into silver pipes and heated at 840-850°C.The formation of the high-Tc phase was found to be promoted in the samples enclosed in the silver pipes, depending upon three factors: grinding time, atmosphere in the pipe and reaction between the powder sample and the silver pipe.

    DOI: 10.2497/jjspm.40.216

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  • XPS STUDY OF ALUMINUM AND FLUORIDE IONS IN THE SYSTEM AL-CD-PB-O-F Reviewed

    J FU, A OSAKA, T NANBA, Y MIURA, H YAMANAKA

    MATERIALS LETTERS   15 ( 4 )   264 - 267   1992.12

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    The A 12p peak was found near 74.7 eV and F 1s peak was located near 68 3.7 eV for the glasses in the system Al-Cd-Pb-O-F. With the increase in the F/0 ratio, the F 1s binding energy decreased and that of Al 2p increased. It is concluded that most of F ions are under ionic interaction with Cd and Pb, and that the rest of F ions substitute 0 in AlX(n) polyhedra (n = 4 or 6; X = F + 0) as the F/0 ratio increases.

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  • INFRARED AND RAMAN-SPECTRA OF BINARY TELLURITE GLASSES CONTAINING BORON AND INDIUM OXIDES Reviewed

    JR QIU, A OSAKA, T NANBA, J TAKADA, Y MIURA

    JOURNAL OF MATERIALS SCIENCE   27 ( 14 )   3793 - 3798   1992.7

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    The constitution of glasses in the systems M2O3-TeO2 (M = B and In) was investigated by Raman and infrared spectroscopy. From the relation between the M2O3 content and the intensity ratios of the deconvoluted Raman peaks I(720)/I(665) and I(780)/I(665), it was concluded that In2O3 behaves as a network modifier to yield TeO3- units and that discrete BO3 and BO4 units construct a network of glasses containing boron oxide. A structural model for those glasses was derived which involves three-coordinated oxygen atoms and TeO4 units of an intermediate configuration, O3Te(delta +) . . . O(delta -).

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  • Network Structure of AlF3-BaF2-CaF2 Glass Reviewed

    T. Nanba, A. Osaka, J. Takada, Y. Miura, H. Inoue, Y. Akasaka, H. Hagihara, I. Yasui

    Journal of Non-Crystalline Solids   140   269 - 274   1992.6

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  • EXAFS OF TELLURIUM IN THE GLASSES OF THE B2O3-TEO2 SYSTEM Reviewed

    A OSAKA, QIU, JR, T NANBA, J TAKADA, Y MIURA, T YAO

    JOURNAL OF NON-CRYSTALLINE SOLIDS   142 ( 1-2 )   81 - 86   1992.4

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    TeK-edge spectra were measured for binary glasses of compositions 0.16B2O3.0.84TeO2 and 0.301B2O3.0.699TeO2. Te-O bond length and coordination number of Te atoms were analyzed to be very similar to those of paratellurite. Within errors of measurement, all the Te atoms were four-coordinated and TeO3+ units were absent in the glasses. It was concluded that some other mechanism should be present to compensate for a negative charge on four-coordinated boron atoms in the glasses.

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  • APPLICATION OF MOSSBAUER-SPECTROSCOPY TO IRON IONS IN LITHIUM TELLURITE GLASSES Reviewed

    JR QIU, A OSAKA, Y MIURA, T NANBA, J TAKADA

    PHYSICS AND CHEMISTRY OF GLASSES   33 ( 1 )   12 - 15   1992.2

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    The local structure around iron atoms in four series of lithium tellurite glasses were studied by means of Mossbauer spectroscopy with Co-57(Pd) and Fe foil as the gamma-ray source and reference. All the spectra showed one symmetric doublet peak. Quadrupole splitting increased with increasing Fe2O3 content and ranged from 0.61 to 0.84 mm/s, whereas the isomer shift was almost independent of Fe2O3 content, ranging from 0.37 to 0.39 mm/s. Comparison of isomer shift and quadrupole splitting values with those of the relevant crystals showed that all the iron ions were trivalent and octahedrally coordinated. The increase in quadrupole splitting with Fe2O3 was attributed to an increase in the geometric distortion of the FeO6 octahedra. Linear correlation between quadrupole splitting and glass transition temperature was tentatively interpreted in terms of the relaxation of the Te-O framework.

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  • Structure and Photochromism of Al-Cd-O-F Glasses Reviewed

    Fu Jie, Akiyoshi Osaka, Yoshinari Miura, Jun Takada, Tokuro Nanba

    Journal of the Society of Materials Science, Japan   41 ( 464 )   578 - 582   1992

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    New photochromic glasses in the system Al-Cd-O-F were obtained. When this type ot glass was irradiated by darkening UV light having the wavelength near the absorption edge, a new absorption was induced almost over the whole visible region. The photo-induced absorption decayed very slowly accompanying luminescence, and its half fading time was remarkably shortened by heating. Infrared and 27Al MAS-NMR spectra indicated that both AlX4 tetrahedra and AlX6 pctahedra (X=O, F) were present and the fraction of octahedra increased with the increasing fluorine content. On the basis of both the ESR spectra and the glass structure model, the color centers were proposed to be oxygen hole centers. © 1992, The Society of Materials Science, Japan. All rights reserved.

    DOI: 10.2472/jsms.41.578

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  • Effect of Li-addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (II).

    Takada Jun, Fujiwara Masashi, Egi Toshio, Nanba Tokuro, Ikeda Yasunori, Takano Mikio, Mazaki Hiromasa

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 5 )   386 - 389   1992

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    The effects of Li-addition to the high-Tc phase in Bi-Pb-Sr-Ca-Cu-O system have been studied for the samples with the nominal composition of Bi:Pb:Sr:Ca:(Cu, Li)=0.96:0.24:1.0:1.1:(1.6-x, x) heated at 840 to 845°C for 144h in air (x=0 to 0.2). The characterization of the samples has been made by DTA, the measurements of XRD and DC electrical resistivity, SEM observation and ICP analysis. The Li-addition promotes the formation of the high-Tc phase. The sample with x=0.05 heated at 842°C for 144h exhibits Tc=116K, while Tc=109K for the Li-free sample (x=0) heated at 842°C for 120h. The results of ICP analysis showed that the Li content of the samples heated at 842°C for 120h was very low.

    DOI: 10.2497/jjspm.39.386

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  • Microstructure of Hydroxyapatite-Hematite Composite Particles Prepared by Ultrasonic Spray Pyrolysis.

    Osaka Akiyoshi, Chiba Akira, Fujii Tatsuo, Nanba Tokuro, Takada Jun, Miura Yoshinari

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 3 )   239 - 242   1992

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    Aqueous solutions of calcium nitrate stabilized with EDTA, ammonium dihydrogen orthophosphate and iron (III) nitrate were mixed before they were subject to ultrasonic spraying and to subsequent pyrolysis in an electric furnace, and particles of 0.45μm in average diameter consisting of hydroxyapatite and hematite were obtained. Surface morphology and microstructure of the particles were examined. A nucleus (hematite)-shell (hydroxyapatite) type structure was observed for larger particles (>0.8μm in diameter) though the particles of medium size apparently had a uniform microstructure. Such structural difference due to the particle size was explained in terms of decomposition of the Ca-EDTA chelating bond at lowest temperatures and temperature distribution in the sprayed mists.

    DOI: 10.2497/jjspm.39.239

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  • Effect of Li Addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (I).

    Ohara Taigen, Endo Kazuyo, Egi Toshio, Nanba Tokuro, Takada Jun, Ikeda Yasunori, Takano Mikio, Bando Yoshichika, Mazaki Hiromasa

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 5 )   382 - 385   1992

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    Effects of the Li-addition to the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system have been studied for samples with starting compositions of Bi:Pb:Sr:Ca:Cu:Li=0.9:0.2:1.0:1.0:1.6:x with x=0-0.10 and heated at 820-850°C for 40-96h. The temperature, at which an endothermic reaction occurred, lowered markedly as x increased. Tc was raised up to 116K for the sample with x=0.03 heated at 840°C for 48h, while a susceptibility measurement revealed that Tc=110K. The lattice constants, a and c, were independent of Li content. ICP analysis showed that the heat treated samples had very low Li content. The results suggest that a small amount of the high-Tc phase with Tc=116K forms on the surface of the high-Tc phase with Tc=110K.

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  • Formation Process of the Li-addition High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System.

    Ohara Taigen, Ito Hiroyuki, Takada Jun, Fujiwara Masashi, Endo Kazuyo, Egi Toshio, Nanba Tokuro, Ikeda Yasunori, Hiroi Zenji, Takano Mikio, Bando Yoshichika

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 9 )   767 - 770   1992

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    Li addition was found to raise Tc up to 116K in the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system. But the role and behavior of Li has not yet been clarified. This study has been done for samples with starting compositions of Bi0.9Pb0.2Sr1.0Ca1.0Cu1.6LixOy with x=0.03 to 0.10 and heated at 825 to 840°C for 1 to 48h. ICP analysis showed that Li content decreased with increasing sintering time. The lattice constant a decreased at first and then gradually increased. On the other hand, the lattice constant c passed through a maximum around 4h.

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  • Superconducting Properties of Silver-sheathed Bi-Pb-Sr-Ca-Cu-O Superconducting Tapes.

    Egi Toshio, Mori Naoyuki, Hosotani Katsunori, Nanba Tokuro, Takada Jun

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 5 )   404 - 407   1992

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    The BPSCCO powder with a nominal composition of Bi:Pb:Sr:Ca:Cu=0.96:0.24:1.0:1.1:1.6 prepared by the co-precipitation method was packed into a Ag tube. The tape was fabricated by plastic deformation. Optimized heat treatment conditions for the tape samples have been studied. The critical current density of the tape samples after the 3rd heat treatment was found to depend on the temperature of the 1st heat treatment. The maximum critical current density was 10, 500A/cm2 at zero field and 77K in the sample subjected to the 1st heat treatment at 845°C. The impurity phases with a particle size of 5-10μm, such as Ca-Sr-Cu-O and Ca-Sr-Pb-O, were present even in the sample with Jc=10, 500A/cm2.

    DOI: 10.2497/jjspm.39.404

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  • Structural study of peroxopolytungstic acid prepared from metallic tungsten and hydrogen peroxide Reviewed

    Tokuro Nanba, Sanae Takano, Itaru Yasui, Tetsuichi Kudo

    Journal of Solid State Chemistry   90 ( 1 )   47 - 53   1991

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    The structure of peroxotungstic acid (W-PTA) prepared from metallic W and aqueous H2O2 was investigated based on Raman, IR, and XRD analyses. W-PTA was an amorphous compound constructed of peroxo polytungstate anions, in which the anions were bound to each other through hydrogen bonding. RDF analyses suggested that the polyanion was W12O38(O2)16-6, in which a six-membered ring of corner-shared polyhedra, such as WO5(O2) or WO6, was sandwiched by two W3O10 units consisting of edge-shared WO6. © 1991.

    DOI: 10.1016/0022-4596(91)90170-M

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  • Structural study of amorphous wo3 thin films prepared by the ion exchange method Reviewed

    T. Nanba, Y. Nishiyama, I. Yasui

    Journal of Materials Research   6 ( 6 )   1324 - 1333   1991

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    The structure of amorphous tungsten trioxide films was investigated with IR and Raman spectroscopic analyses and an XRD method. The films were prepared by ion exchange from sodium tungstate as a starting material. Films consisted of microclusters of 10–30 Å diameter, in which the networks are formed with WO6 octahedra sharing their corners and edges. The networks in the as-prepared samples consisted of WO6 units with low symmetry, in which termination by W=O and W — OH2 groups was common. As the post-annealed temperature became higher, the symmetry of WO6 was improved and the edge-sharing octahedra disappeared. © 1991, Materials Research Society. All rights reserved.

    DOI: 10.1557/JMR.1991.1324

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  • Application of Thin Film Diffractometer to Structural Study of Amorphous Thin Films Reviewed

    Tokuro Nanba, Itaru Yasui

    Analytical Sciences   5 ( 3 )   257 - 262   1989.2

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    The X-ray diffraction intensity obtained using a thin-film diffractometer has a special angular dependence as a result of its optical arrangement, owing to the absorption of X-rays by a thin-film specimen. In this study we examined in detail the influence of a secondary soller slit and developed a method of date correction so as to produce good agreement between the observed and calculated dependence. This method has been successfully applied to a structural study of WO3 evaporated film specimens. © 1989, The Japan Society for Analytical Chemistry. All rights reserved.

    DOI: 10.2116/analsci.5.257

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  • X-ray diffraction study of microstructure of amorphous tungsten trioxide films prepared by electron beam vacuum evaporation Reviewed

    Tokuro Nanba, Itaru Yasui

    Journal of Solid State Chemistry   83 ( 2 )   304 - 315   1989

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    Microstructure of a-WO3 films prepared by electron beam vacuum evaporation was examined based on XRD. The peak positions in the observed PDFs corresponded with those in the PDFs calculated from the crystal structure of hexagonal WO3 and WO3 · 1 3H2O, and the framework structure of the films was therefore thought to consist of the basic structure of these crystals, three-, four-, and six-membered rings formed by WO6 octahedra. Microcluster models in which the atomic arrangement was similar to that of hexagonal WO3 were assumed and investigated in detail. The pair distribution functions calculated from these models showed good agreement with the observed values, and the structure of a-WO3 films was consequently suggested to consist of clusters in which the octahedra were arranged in the same manner as those in hexagonal WO3. © 1989.

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  • Diffraction Studies of AlF3-BaF2-CaF2 Glasses Reviewed

    T. Nanba, H. Inoue, Y. Arai, H. Hasegawa, M. Misawa, I.Yasui

    Materials Science Forum   32-33   385 - 390   1988.9

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  • Ceramic Data Book 2013

    ( Role: Joint author)

    2013.12 

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  • ガラスの百科事典

    作花済夫( Role: Joint author ,  19.7 分光法によるガラス構造の研究)

    朝倉書店  2007.10  ( ISBN:9784254201246

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  • ガラス工学ハンドブック

    山根正之( Role: Joint author ,  第II編 ガラス構造論 3.ガラス構造論 3.2 ガラス構造解析)

    朝倉書店  1999.7  ( ISBN:9784254252385

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  • セラミックス用語辞典

    セラミックス用語辞典編集委員会( Role: Joint author)

    日刊工業新聞社  1997.9  ( ISBN:4526040622

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  • ニューガラスハンドブック

    ニューガラスハンドブック編集委員会( Role: Joint author ,  I 基礎編 2 ニューガラスの分析法 2・3 構造解析)

    丸善  1991.7  ( ISBN:4621036025

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  • ファイバ延伸処理によるガラスの異方性発現挙動の調査

    三宅鴻大, 崎田真一, 紅野安彦, 難波徳郎

    セラミックス基礎科学討論会講演要旨集   59th (CD-ROM)   2021

  • 塩化物添加による土壌中の有害元素(Pb,Cd,Cr)の揮発挙動

    松葉和哉, 崎田真一, 紅野安彦, 難波徳郎

    セラミックス基礎科学討論会講演要旨集   59th (CD-ROM)   2021

  • 脱リンスラグの還元溶融に伴うリンの分配挙動

    横山晃青, 崎田真一, 紅野安彦, 難波徳郎

    セラミックス基礎科学討論会講演要旨集   59th (CD-ROM)   2021

  • 液相プロセスによる全固体ナトリウムイオン電池用硫化物固体電解質の作製

    宮川慶太, 紅野安彦, 難波徳郎, 仁科勇太

    セラミックス基礎科学討論会講演要旨集   59th (CD-ROM)   2021

  • Development of Phosphorus Recovery Process from Dephosphorization Slag

    横山晃青, 崎田真一, 紅野安彦, 難波徳郎

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

  • Anisotropy evaluation of compressively deformed metaphosphate glasses with divalent metals

    朝倉啓陽, 崎田真一, 紅野安彦, 難波徳郎

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

  • Light-emitting characteristics of SnO-ZnO-P2O5 system glass

    秦光次郎, 崎田真一, 紅野安彦, 難波徳郎

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

  • Effect of bond valence sum constraints in a reverse Monte Carlo structural modeling of lead borate glass

    長尾正昭, 崎田真一, 紅野安彦, 難波徳郎, 椋木敦, 千葉保, 菊池孝浩, 桜木智史, 大和田仁

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

  • Journal of the Ceramic Society of Japan The 57th Symposium on Basic Science of Ceramics Preface

    Tokuro Nanba, Akira Nakajima, Masato Kakihana, Masayoshi Fuji, Youichi Shimizu, Soshu Kirihara, Takumi Fujiwara

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   127 ( 10 )   2019.10

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    DOI: 10.2109/jcersj2.127.P10-1

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  • 鉛ホウ酸塩系ガラスの逆モンテカルロ法構造モデル化におけるBond Valence Sum拘束の有効性

    長尾正昭, 崎田真一, 紅野安彦, 難波徳郎, 椋木敦, 千葉保, 菊池孝浩, 桜木智史, 大和田仁

    ガラスおよびフォトニクス材料討論会講演要旨集   60th   2019

  • 2価金属メタリン酸塩ガラスの圧縮変形処理に伴う異方性の評価

    朝倉啓陽, 崎田真一, 紅野安彦, 難波徳郎

    セラミックス基礎科学討論会講演要旨集   57th   2019

  • Structure and bonding states of glasses Invited

    Tokuro NANBA, Shinichi SAKIDA, Yasuhiko BENINO

    24 ( 391 )   339 - 344   2017.11

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  • Research Trend in Division of Basic Science in The Ceramic Society of Japan

    Nobuhito IMANAKA, Naoyoshi NUNOTANI, Tokuro NANBA, Hirokazu SASAKI, Akira NAKAJIMA

    Ceramics Japan : bulletin of the Ceramic Society of Japan   52 ( 6 )   437 - 440   2017.6

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  • Preface

    Nobuhiro Kumada, Nobuhito Imanaka, Tokuro Nanba

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 10 )   P10 - P10   2017

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  • Recovery of Phosphorous from Slags Invited

    Tokuro NANBA, Shinichi SAKIDA, Yasuhiko BENINO

    Phosphorus letter   86 ( 1 )   40 - 46   2016.6

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  • Environment and Glass in Japan Invited

    Tokuro NANBA, Shinichi SAKIDA, Yasuhiko BENINO

    Bulletin of the Ceramic Society of Japan   50 ( 12 )   944 - 946   2015.12

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  • Development of Recycling Process Utilizing Glass Properties Invited

    Tokuro NANBA, Shinichi SAKIDA, Yasuhiko BENINO

    22 ( 379 )   414 - 419   2015.11

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  • Material design for the ceramics coating with high mold releasability by using molecular orbital calculations

    T. Nanba, J. Fujihara, S. Sakida, Y. Benino

    Journal of the Faculty of Environmental Science and Technology   19 ( 1 )   22 - 25   2014.3

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  • Advanced Ceramic Science and Technology in the Western Pacific Rim Area Preface

    Akiyoshi Osaka, Yoko Suyama, Akira Kishimoto, Nobuhito Imanaka, Tokuro Nanba, Satoshi Hayakawa

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   120 ( 1407 )   2012.11

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  • ガラスの相分離を利用した有用元素の回収

    難波徳郎, 崎田真一, 紅野安彦

    セラミックス   47 ( 2 )   105 - 109   2012

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  • New Glass Research Topics : Application of INTERGLAD Database and Multiple Regression Analysis for Structural Study of Glasses

    New glass   26 ( 4 )   21 - 25   2011.12

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  • ガラスの相分離を利用した無機系廃棄物のケミカルリサイクル

    難波徳郎, 崎田真一, 紅野安彦

    Phousphorus Letter   70 ( 70 )   27 - 34   2011

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  • Structure and Basicity of Borosilicate Glasses

    T. Nanba, S. Sakida, Y. Benino, Y. Miura

    NEW GLASS   25 ( 4 )   28 - 32   2010.12

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  • Material recycling of inorganic sludge by wet ball milling

    Environmental research & control   31 ( 31 )   26 - 31   2009

  • 鉛フリー光学ガラスとしてのSnO-B2O3 ガラスの光学特性

    崎田真一, 難波徳郎, 三浦嘉也

    環境制御   30   39 - 44   2008

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    The preparation of SnO-B(2)O(3) and SnO-SiO(2) glasses by melting in Ar atomosphere was performed. The prepared SnO-B(2)O(3) glasses were large enough to measure optical properties whereas the vitrification in SnO-SiO(2) system was very difficult. PbO-B(2)O(3) and BiO1.5-B(2)O(3) glasses were also prepared for comparison with SnO-B(2)O(3) glasses. The densities, glass transition temperatures, and optical properties such as refractive indices, dispersion, and transmission spectra of SnO-B(2)O(3), PbO-B(2)O(3), and BiO(1.5)-B(2)O(3) glasses were measured. On the basis of the obtained results, the potential for SnO-B(2)O(3) glasses as lead-free glasses is particularly discussed from the viewpoint of optical properties.

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  • ガラスの相分離を利用した都市ゴミ溶融スラグのマテリアルリサイクル

    今岡卓也, 崎田真一, 難波徳郎, 三浦嘉也

    岡山大学環境理工学部研究報告   Vol.12(1) pp.161-165   2007

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  • Structural Analysis of Amorphous NbOx Thinfilm Using Synchrotron Radiation Invited

    Go SAJIKI, Hiroshi OKANO, Yasuhiko BENINO, Tokuro NANBA

    Bulletin of the Ceramic Society of Japan   52 ( 5 )   362 - 364   2007

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  • Material recycling of blast furnace slag by phase separation of glass

    29   11 - 15   2007

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  • Regression Analysis on the Amount of Tetrahedral Boron in Borosilicate Glasses

    T. Nanba, S. Sakida, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Recycling of Municipal Waste Slag Using Phase Separation of Glass

    T. Imaoka, S. Sakida, T. Nanba, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Influence of the Composition and Microstructure on Property of the Al2O3-Cr2O3 Refractory Materials

    M. Fujita, J. Ommyoji, A. Yamaguchi, K. Inukai, T. Nanba, Y, Miura

    Proceedings of the 1st International Congress On Ceramics, Toronto, Canada   2006

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  • Ab Initio Calculation of 17O NMR Parameters of Tricluster Oxygen Sites in Borosilicate Glasses

    Y. Yoneyama, S. Sakida, T. Nanba, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Structure and Optical Properties of TiO2 Containing Oxide Glasses

    K. Inoue, S. Sakida, T. Nanba, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Correlation between the Basicity and Optical Property of Er3+ Ion in Oxide Glasses

    Y. Tateyama, S. Sakida, T. Nanba, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Molecular Orbital Calculation on the Chemical Bonding Character of Phosphate Glasses

    Y. Asano, S. Sakida, T. Nanba, Y. Miura

    Proceedings of Materials Science & Technology 2006, Cincinnati, USA   2006

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  • Optical properties of waveguides of Er3+-doped tellurite glasses prepared by Ag+-Na+ ion-exchange

    S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Compositional Dependence of Refractive Index in Tellurite Glasses

    S. Akamine, S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Theoretical Interpretation of 17O NMR Spectra in Borosilicate Glasses

    M. Urushihara, S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations

    Y. Domori, S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Optical properties of rare earth ions in heavy metal oxide glasses

    R. Yamaguchi, S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Optical Properties of Bi2O3-La2O3-Al2O3-B2O3 Glasses

    S. Sumimiya, S. Sakida, T. Nanba, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • Bi2O3系ガラスの構造

    難波徳郎, 崎田真一, 三浦嘉也

    New Glass   20 ( 2 )   35 - 43   2005

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  • Chemical Bonding Character of the Network Forming Bonds in Oxide Glasses Invited

    T. Nanba, S. Sakida, Y. Miura

    Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6)   2005

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  • 電位差適定によるセラミック粉体の表面電位の測定

    三浦嘉也, 難波徳郎, 篠田真克

    岡山大学環境理工学部研究報告   2004

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  • Spectral properties of erbium-doped HMO glasses for 1.5 mu m broadband amplification

    T Okada, S Matsumoto, T Nanba, Y Miura

    INTERNATIONAL SYMPOSIUM ON PHOTONIC GLASS (ISPG 2002)   5061   67 - 71   2003

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    The heavy metal oxide (HMO) glasses in the ternary Bi2O3-WO3-TeO2 system were prepared to investigate the Er3+ amplification properties. The present HMO glasses showed larger and broader Er3+ emission spectra as compared with the conventional silica-based glasses. Dominant factors on the emission intensity and bandwidth were explored on the basis of theories. The emission intensity was successfully explained by the theoretical radiative decay rate, and it was also confirmed that the refractive index was predominant on the emission intensity. A Judd-Ofelt Omega(6) parameter was also examined, and its influence on the bandwidth was not recognized. Other factors, such as O1s binding energy and structural variation around Er3+ ions, were estimated, and their effects on the bandwidth were however not clarified. The unique chemical bonding character in the HMO glasses might be responsible for the spectral broadening.

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  • 長残光性透明ガラスセラミックスの作製における超音波前処理効果

    井上輝英, 中島瑞穂, 難波徳郎, 三浦嘉也

    岡山大学環境理工学部研究報告   2002

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  • Tm3+含有結晶化ガラスのアップコンバージョン特性と光散乱

    三浦嘉也, 丁勇, 村田隆, 姫井裕助, 難波徳郎

    岡山大学環境理工学部研究報告   2002

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  • Photoconductive and Photovoltaic Properties in Cadmium Bismuth Aluminate Glasses

    Chen Danping, Watanabe Tomohiro, Miura Yoshinari, Nanba Tokuro

    4 ( 1 )   147 - 158   1999

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  • Preparation and Properties of ZnO Transparent Conductive Thin Films by Activated Reactive Evaporation Method

    2 ( 1 )   121 - 129   1997.1

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  • 314 Sm_2Fe_<17>N_x 化合物中のα-Fe 相の析出挙動について

    福井 力雄, 和田 誠司, 長江 正寛, 藤井 達夫, 高田 潤, 難波 徳郎, 桑原 秀行

    学術講演会講演論文集   44   93 - 94   1995

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  • Mechanical Grinding and Reforming Process of the Pb-substituted 2223 Phase.

    Takada Jun, Nagae Masahiro, Kusano Yoshihiro, Nanba Tokuro, Ikeda Yasunori, Takano Mikio

    J. Jpn. Soc. Powder Powder Metallurgy   41 ( 4 )   396 - 399   1994.4

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    Mechanical grinding and reforming process of the Pb-substituted 2223 phase has been studied for the monophasic samples with a composition of Bi0.9Pb0.2SrCaCu1.6OZ. The 2223 phase changes to ultla-fine powder by full grinding, exhibiting no magnetic response, while the ultra-fine powder and the small 2223 crystals coexist in samples ground for short periods. Some second phases were formed in the ground powder subjected to heating at temperatures between 500°C and 800°C. On the other hand, annealing of the bulk samples below 800°C leads to precipitation of the 3321 phase identified as Sr2.5Bi0.5Pb3Ca2CuOZ. Precipitation of second phases in the coexistent powder was interpreted by those in ultra-fine powder and bulk samples.

    DOI: 10.2497/jjspm.41.396

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  • Effect of Annealing on Pinning Force of Bi-2223 Phase

    Yoshihiro Kusano, Youichi Ohkami, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano, Yoshichika Bando

    Journal of the Japan Society of Powder and Powder Metallurgy   41 ( 12 )   1501 - 1504   1994

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    Pining characteristics due to the precipitates of the "3321"(Sr2.5Bi0.5Pb3Ca2CuOz) phase have been studied in the Bi-2223 phase in the Bi-Pb-Sr-Ca-Cu-O system by mainly XRD and magnetic measurements. The precipitation of the "3321" phase was controlled by changing annealing temperature and annealing time in air. On annealing at 750°C for 10min and 1h, the larger hysteresis loops in M-H curves were observed in comparison with the initial one before annealing. However, the hysteresis loops became smaller with increasing precipitation of the "3321 " phase. Furthermore, the 2223 phase annealed at 400°C and 500°C, in which no precipitation of the "3321 " phase was observed, exhibits larger hysteresis loops.

    DOI: 10.2497/jjspm.41.1501

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  • Effect of Heating Atmosphere on Segregation and Dissolution of the Pb-compound in the Bi-2223 Phase

    Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano

    Journal of the Japan Society of Powder and Powder Metallurgy   41 ( 4 )   388 - 391   1994

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    Thermal behavior of the Bi-2223 phase in the Bi, Pb-Sr-Ca-Cu-O system, especially segregation and dissolution reaction of the "3321" phase which was identified as Sr2.5Bi0.5Pb3Ca2CuO2, has been studied by XRD, SQUID and resistivity measurements. On annealing below 830°C in air, the "3321" phase precipitated from the 2223 crystals. When the 2223 phase was annealed at 750°C in O2stream, the precipitation of the "3321 " phase increased. On annealing at 750°C in Ar stream, however, no precipitation of the "3321" phase was detected. By reheateing at 850°C even for 1min, the "3321" phase was almost dissolved into the mother 2223 crystals. When the 2223 phase was reheated at 750°C in Ar stream after annealing at 750°C in air, the "3321 " phase disappeared. On the contrary, the "3321" phase was stable on reheating at 870°C in O2 stream. Therefore, it seems that the "3321" and the 2223 phase coexist in epuilibrium in a high oxygen partial pressure.

    DOI: 10.2497/jjspm.41.388

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  • Refining and Thermal Behavior of the Bi-2223 Phase

    Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano, Yoshichika Bando

    Journal of the Japan Society of Powder and Powder Metallurgy   41 ( 12 )   1497 - 1500   1994

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    Refining behavior due to a small mechanical force and re-formation process of the 2223 phase on heating have been examined for the samples with a nominal composition of Bi1.8Pb0.4Sr2Ca2Cu3.2Oz by XRD, TEM, ED, AFM and TG-DTA. The 2223 phase is brittle and easily cleaved at Bi-O double layers in its crystals by a small mechanical force, resulting in changing into the superfine powder with a thickness of 1/2c. On heating the ground powder at 500°C to 800°C in air, various phases were formed from the superfine powder.

    DOI: 10.2497/jjspm.41.1497

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  • 31p-PSB-46 Preparation of the Fe_3O_4/MO artificial superlattices by a reactive evaporation method

    Fujii T., Sakamoto M., Asano M., Nanba T., Osaka A., Takada J., Miura Y.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   48 ( 3 )   121 - 121   1993.3

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  • Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. Reviewed

    Takada Jun, Fujisaka Kosei, Hosotani Katsunori, Egi Toshio, Kusano Yoshihiro, Nanba Tokuro, Ikeda Yasunori, Takano Mikio

    J. Jpn. Soc. Powder Powder Metallurgy   40 ( 2 )   204 - 207   1993.2

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    Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300-820°C. BaPb0.75Bi0.25O3 was also formed in the Ba-added samples heated at 700-800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.

    DOI: 10.2497/jjspm.40.204

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  • Effect of Li Addition to the Low-Tc Phase in the Bi-Sr-Ca-Cu-O System. (II). Reviewed

    Endo Kazuyo, Kusano Yoshihiro, Nanba Tokuro, Takada Jun

    J. Jpn. Soc. Powder Powder Metallurgy   40 ( 2 )   196 - 199   1993.2

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    The effect of Li addition to the low-Tc phase in Bi-Sr-Ca-Cu-O system has been studied for the samples with nominal compositions of Bi:Sr:Ca:Cu:Li=2:3-y:y:2:x(x=0 to 0.6, y=1.25, 1.5, 2.0) heated at 600 to 760°C for 12 to 48h in air. The Li addition promotes the formation of the low-Tc phase. Monophasic samples of the low-Tc phase were obtained for x=0.2 to 0.6 by heating at remarkably lower temperatures. The lattice constant c of the low-Tc phase depends on y as well as Li content. As the heating time extends, the Li content in the low-Tc phase decreases. For y=1.25 and 1.5 c increases as the Li content increases. On the contrary, c for y=2.0 decreases as the Li content increases.

    DOI: 10.2497/jjspm.40.196

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  • Phases and their relations in the Bio1.5-Sro(SrCo3)-cuo System at 720° Reviewed

    Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano, Yasuo Takeda

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 11 )   1049 - 1052   1993

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    Phases and their relations in the BiO1.5-SrO(SrCO3)-CuO system have been studied mainly by XRD. The crystal structure of the newly found phase has been examined by XRD, TEM and ED. Phase equilibrium was established at 720°C in air. Monophasic products of the newly found phase were obtained at 720°C for a composition of Bi:Sr:Cu=0.25:0.55:0.20. The newly found phase has a tetragonal structure with lattice parameters of a=5.513Å and c=39.93Å. © 1993, Japan Society of Powder and Powder Metallurgy. All rights reserved.

    DOI: 10.2497/jjspm.40.1049

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  • Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-o System (IV)—Formation of the High-Tc Phase in Amorphous Powder Prepared by Mechanical Grinding— Reviewed

    Yoshihiro Kusano, Toshinobu Niinae, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 2 )   187 - 190   1993

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    Chemical and mechanical stability of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system has been studied. In particular, the formation of the high-Tc phase has been discussed for samples of the amorphous powder with a composition of Bi0.9Ph0.2Sr1.0Ca1.0Cu1.6Oz prepared by mechanical grinding. Annealing of the amorphous powder at low temperatures(500-800°C) leads to precipitation of some impurity phases. The Pb-rich low-Tc phase with an orthorhombic structure symmetry was found to form in samples of the amorphous powder heated at 820°C in air. The formation of the Pb-rich low-Tc phase seems to suppress the formation of the high-Tc phase in subsequent heat treatments at 850°C. Almost monophasic products of the high-Tc phase were obtained when the amorphous powder was heated at 840°C for 48h and subsequently at 850°C for 96h after calcination at 720°C. © 1993, Japan Society of Powder and Powder Metallurgy. All rights reserved.

    DOI: 10.2497/jjspm.40.187

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  • Chemical Stability of the Bi-2223 Phase

    Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano, Toshio Egi

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 11 )   1057 - 1060   1993

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    Chemical stability of the Bi-2223 phase has been studied for the samples Bi0.9Pb0.2SrCaCu1.6O2 Annealing of the bulk samples below 800°C leads to precipitation of the 3321 phase identified as Sr2.5Bi0.5Pb3Ca2CuOz. The precipitation of the 3321 phase from the 2223 phase decreases the volume fraction of the 2223 phase but Tc (x) remains unchanged. It was found by XRD and SQUID measurements and SEM observation that, through reheating at 850°C after heating at 750°C, the 3321 phase disappeares and the volume fraction of the 2223 phase perfectly recovers.

    DOI: 10.2497/jjspm.40.1057

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  • Preparation of Fe3O4 Single-crystalline Films by Reactive Evaporation Method. Reviewed

    Fujii Tatsuo, Sakamoto Masakatsu, Asano Mitsuhiro, Nanba Tokuro, Osaka Akiyoshi, Miura Yoshinari, Takada Jun, Shimura Ken-ichi, Terashima Takahito, Bando Yoshichika

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 11 )   981 - 984   1992.11

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    (111)- and (100)-oriented Fe3O4 films were epitaxially formed on a-A12O3(0001) and MgO(100) single-crystalline substrates, respectively, by reactive evaporation method. The formation ranges of the epitaxial Fe304 films were determined as a function of substrate temperature, oxygen partial pressure, and a deposition rate. Their crystalline qualities were examined by various methods such as X-ray diffraction, RHEED and resistivity mesurements. A lattice mismatch of about 0.3% between Fe3O4 and MgO was very small. Then the film deposited on MgO seemed to have a good crystallinity and a smooth surface. Moreover the Verwey transition was clearly detected by a resistivity mesurement at about 110K. The transition temperature was nearly consistent with that of the bulk, indicating a good stoichiornetry of the sample film.

    DOI: 10.2497/jjspm.39.981

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  • Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (I). Effects of Heat Treatment of Crushed Powder of the High-Tc Phase.:Effects of Heat Treatment of Crushed Powder of the High-Tc Phase Reviewed

    Takada Jun, Hosotani Katsunori, Fujiwara Masashi, Kusano Yoshihiro, Nanba Tokuro, Ikeda Yasunori, Takano Mikio

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 9 )   779 - 782   1992.9

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    Chemical and mechanical stability of the high-Tc phase has been studied for the samples of Bi0.9Pb0.2Sr1.0Ca1.0Cu1.6Ox. Mechanical grinding converts the high-Tc phase into a nonsuperconducting amorphous phase. The ground high-Tc phase is not stabilized on annealing at lower temperatures below 820°C. Annealing at lower temperature leads to precipitation of some impurity phases and the low-Tc phase which depends on annealing temperature and time. The high-Tc phase is recovered by annealing at 850°C. The lattice parameters a and c of the high-Tc phase annealed at 850°C are longer than those below 820°C.

    DOI: 10.2497/jjspm.39.779

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  • Effect of Li Addition to the Low-Tc Phase in the Bi-Sr-Ca-Cu-O System. (I). Reviewed

    Takada Jun, Endo Kazuyo, Kusano Yoshihiro, Nanba Tokuro

    J. Jpn. Soc. Powder Powder Metallurgy   39 ( 9 )   763 - 766   1992.9

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    The effect of Li-addition to the low-Tc phase in Bi-Sr-Ca-Cu-O system have been studied for the samples with nominal compositions of Bi:Sr:Ca:Cu:Li=2:1.5:1.5:2-x:x heated at 720 to 845°C for 12 to 24h in air (x=0 to 0.8). The Li-addition promotes the formation of the low-Tc phase. Single phase of the low-Tc phase was obtained for the sample with x=0.2 to 0.4 more easily than the sample with x=0. The lattice constant c of the low-Tc phase increases as the Li content increases. As the heating period becomes longer, the amount of Li content in the low-Tc phase decreases.

    DOI: 10.2497/jjspm.39.763

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  • Preparation and Characterization of Ti(2)O(3) Films Deposited on Sapphire Substrate by Activated Reactive Evaporation Method

    Fujii Tatsuo, Sakata Naoki, Nanba Tokuro, Osaka Akiyoshi, Miura Yoshinari, Takada Jun

    Memoirs of the Faculty of Engineering, Okayama University   26 ( 2 )   69 - 75   1992.3

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  • Effect of Ba Addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System(V) Reviewed

    Yoshihiro Kusano, Kazuhiro Yamaguchi, Minoru Fukuhara, Akira Doi, Toshio Takada, Masashi Fujiwara, Jun Takada

    Jpn. J. Powder Powder Metall.   39 ( 5 )   374 - 377   1992

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    The effects of cooling condition and Ba addition time on Tc of high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system were studied. X-ray diffraction and DC resistance measurements were carried out to observe phase identification and Tc values for a series of samples with compositions of Bi:Pb:Sr:Ba:Ca:Cu=0.9:0.2:1.0:X:1.0:1.6(X=0-0.05). When a mixture of BaCO3 and synthesized high-Tc phase was heated at 850°C for 60h in air, only a solid solution of high-Tc phase was formed in a quenched sample. However, in a sample cooled down slowly, Bi3(Sr, Ba)4Ca3Oz was found as an impurity phase in addition to the solid solution of high-Tc phase. Mixtures of BaCO3 (X=0.04) and the rest of metal oxides or metal carbonates were heated at 845°C 96h in air. Bi3(Sr, Ba)4Ca3Oz was also found in addition to the high-Tc phase in a quenched sample. When BaCO3 was added to the synthesized high-Tc phase, Tc(R=0) was 119K for the heated samples. When BaCO3 was added in starting materials, Tc decreased to 110K due to the formation of Bi3(Sr, Ba)4Ca3OZ.

    DOI: 10.2497/jjspm.39.374

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  • Preparation of Fe3O4/MgO Artificial Superlattices by Activated Reactive Evaporation Method Reviewed

    Masakatsu Sakamoto, Mitsuhiro Asano, Tatsuo Fujii, Tokuro Nanba, Akiyoshi Osaka, Yoshinari Miura, Jun Takada

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   985 - 988   1992

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  • Effect of Ba-addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (VI)

    Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Naoya Kobayashi, Kazuhiro Yamaguchi, Minoru Fukuhara, Akira Doi, Toshio Takada, Yasunori Ikeda, Mikio Takano, Hiromasa Mazaki

    Journal of the Japan Society of Powder and Powder Metallurgy   39 ( 9 )   771 - 774   1992

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    The effects of Ba addition and grinding time on Tc of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system have been studied. Samples with compositions of Bi:Pb:Sr:Ba:Ca:Cu=0.9:0.2:1.0:X:1.0:1.6(X=0-0.05) were prepared by grinding the high-Tc phase and BaCO3 powders for various periods (20 to 120min). The high-Tc phase degraded with grinding time. In samples of a composition of X=0.05 heated at 845≥C for 60h in air, a small amount of the low-Tc phase and Bi3(Sr, Ba)4Ca3Oz besides the high-Tc phase were formed. The heating led to the grain growth of the high- Tc phase with increasing grinding time. However, Tc(R=0) was decreased due to the formation of the low-Tc phase and Bi3(Sr, Ba)4Ca3Oz.<BR>In a sample with X=0.05 heated at 850°C for 60h in air, only a solid solution of the high-Tc phase was formed. Tc(R=O)=125K was attained in this sample. The Meissner diamagnetic response at 125K was confirmed by SQUID, but the volume fraction of the 125K phase was estimated below 1%.

    DOI: 10.2497/jjspm.39.771

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  • Effect of Ba-addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O system Reviewed

    Masashi Fujiwara, Tokuro Nanba, Jun Takada, Zenji Hiroi, Yasunori Ikeda, Mikio Takano

    Journal of the Japan Society of Powder and Powder Metallurgy   38 ( 8 )   1039 - 1042   1991

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    The effects of Ba-addition to the high-Tc phase in the Bi-Pb-Sr-Ca-Cu system have been studied for the samples with a starting composition of Bi:Pb:Sr:Ba:Ca:Cu=0.9:0.2:1.0:x: 1.0:1.6 heated at 850°C in air (x=0 to 0.10). Various amounts of BaCO3 were added to the high-Tc phase with a composition of Bi:Pb:Sr:Ca:Cu=0.9:0.2:1.0:1.0:1.6. Ba-addition raises Tc
    Tc(R~0)=122K and Tc(R=0)=120K for the sample with x=0.05 heated at 850°C for 60h. XRD and ICP analyses indicate that the high-Tc phase contains Ba of x≦0.05 as a solid solution. © 1991, Japan Society of Powder and Powder Metallurgy. All rights reserved.

    DOI: 10.2497/jjspm.38.1039

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  • Anisotropic Structure of Metaphosphate Drawn Glass by Molecular Dynamics Simulation

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  • 都市ごみ溶融スラグの構成元素の溶出挙動

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  • 都市ごみ溶融スラグからの元素回収プロセスと機能付与

    セラミックス基礎科学討論会  2015 

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  • Structural analysis of tin phosphate glasses by synchrotron radiation

    Annual Meeting of International Congress of Glass  2015 

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  • プラズマ放電焼結法を用いたBi 系新規蛍光体の作製

    日本セラミックス協会年会  2014 

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    日本セラミックス協会秋季シンポジウム  2014 

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  • XPSおよびDFT計算による酸化ニオブ結晶多形の電子状態解析

    日本セラミックス協会秋季シンポジウム  2014 

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  • 放射光を用いたスズリン酸塩系ガラスの構造解析

    日本セラミックス協会秋季シンポジウム  2014 

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  • アルカリホウ酸塩系ガラスの仮想温度と構造の関係性

    ガラスおよびフォトニクス材料討論会  2014 

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  • 逆モンテカルロ法を用いたバイオ酸化鉄の構造決定

    ガラスおよびフォトニクス材料討論会  2014 

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  • Observation of inhomogeneous structure of bismuth zinc borate glasses

    The 7th International Symposium on Surface Science  2014 

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  • 鉄酸化細菌が作る鉄酸化物の構造解析と応用

    日本セラミックス協会秋季シンポジウム  2014 

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  • 溶融スラグと 耐火物材料の反応性評価

    ヤングセラミストミーティングin中四国  2014 

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  • スズリン酸塩系ガラスの作製と発光特性

    ヤングセラミストミーティングin中四国  2014 

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  • 分子動力学法によるメタリン酸塩伸長ガラスの異方性構造解析

    ガラスおよびフォトニクス材料討論会  2014 

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  • 鉛ホウ酸塩系ガラスの構造再現に用いる原子間ポテンシャルの構築

    ヤングセラミストミーティングin中四国  2014 

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  • ガラスへの金属ピン貫入に伴う歪形成過程のシミュレーション

    ヤングセラミストミーティングin中四国  2014 

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  • 汚染土壌の無害化処理プロセスに関わる基礎的研究

    ヤングセラミストミーティングin中四国  2014 

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  • プローブイオンを用いたガラスやグの塩基度評価

    ヤングセラミストミーティングin中四国  2014 

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  • 還元溶融法による鉄鋼スラグ中の鉄の分離

    日本セラミックス協会年会  2014 

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  • MgO-Al2O3 系Cr フリー耐火物へのSiC 添加効果

    セラミックス基礎科学討論会  2014 

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  • ガラスの性質を利用した未利用資源の回収

    セラミックス基礎セミナー  2014 

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  • BPI ガラス固化体の構造再現に用いる原子間ポテンシャルの構築

    日本セラミックス協会年会  2014 

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  • ビスマス亜鉛ホウ酸塩ガラスの不均質構造の観察

    日本セラミックス協会年会  2014 

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  • ガラスの分相促進剤として用いるホウ素の循環再利用プロセスの開発

    セラミックス基礎科学討論会  2013 

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  • Bi2O3-MO-B2O3(M=Zn,Ca,Sr)系ガラスの結晶化と非線形光学機能発現

    2013年会  2013 

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  • X線、中性子回折およびXAFSを用いた鉛ホウ酸塩系多成分ガラスの構造解析

    2013年会  2013 

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  • Na2O-CaO-B2O3-SiO2系ガラスの分相に伴う遷移金属元素の分配

    セラミックス基礎科学討論会  2013 

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  • 下水処理汚泥からのリンの回収プロセスの開発

    セラミックス基礎科学討論会  2013 

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  • スズリン酸塩系ガラスの蛍光特性、耐水性に及ぼす酸化物の添加効果

    2013年会  2013 

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  • スパッタリング法によるNbOx薄膜の作成と光学特性の評価

    2013年会  2013 

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  • 家庭ごみ溶融スラグのケミカルリサイクルプロセスにおけるスラグ構成成分の分配挙動

    2013年会(サテライト)  2013 

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  • 合成系BIOXの構造解析

    ヤングセラミストミーティングin中四国  2013 

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  • 化学量論結晶化ガラスの結晶化度評価と等温結晶化速度論

    2013年会  2013 

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  • SnO ・P2O5系ガラスの結晶化と熱的・学安定性

    ヤングセラミストミーティングin中四国  2013 

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  • 分子動力学法による伸長ガラスの異方性構造解析

    ガラスおよびフォトニクス材料討論会  2013 

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  • 分子軌道計算と光電子分光によるアモルファスNbOxの短距離構造の検討

    応用物理学会秋季学術講演会  2013 

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  • 分子軌道計算によるNbO6八面体の連結様式が電子状態に及ぼす影響評価

    応用物理学会春季学術講演会  2013 

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  • 分子軌道計算によるNbO6八面体の連結様式が電子状態に及ぼす影響評価

    2014年春季講演会  2013 

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  • PとTiの分離

    ヤングセラミストミーティングin中四国  2013 

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  • 電界イオン交換で生成する銀微粒子の状態

    ヤングセラミストミーティングin中四国  2013 

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  • ガラスの構造情報を用いた重回帰分析による特性予測

    ガラスおよびフォトニクス材料討論会  2013 

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  • 都市ごみ溶融スラグの構成元素の溶出挙動

    ガラスおよびフォトニクス材料討論会  2013 

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  • ホウ酸添加スラグと耐火物の反応性

    ヤングセラミストミーティングin中四国  2013 

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  • ホウケイ酸ガラスの分相制御と交番電場効果

    ヤングセラミストミーティングin中四国  2013 

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  • Nb2O5系結晶多形のDFT計算とバンド構造

    ヤングセラミストミーティングin中四国  2013 

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  • アモルファス酸化ニオブの光吸収特性と分子軌道計算による電子状態評価

    応用物理学会学術講演会  2012 

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  • Effect of Nb2O5 addition to SnO-P2O5 glass

    IUMRS-ICEM 2012  2012 

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  • Preparation and characterisation of optical waveguides of Er3+ doped tellurite glasses by field assisted Ag+ Na+ ion exchange

    Living Glass 2012  2012 

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  • Distribution behaviour of inorganic constituents in municipal waste slag due to phase separation of vitrified slag

    Living Glass 2012  2012 

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  • Surface crystallisation behaviour and non linear optical property of bismuth zinc borate glasses

    Living Glass 2012  2012 

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  • フレスノイト組成を有するガラスの高温X線回析を用いた結晶化過程の解析

    ヤングセラミストミーティングin中四国  2011 

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  • 電界イオン交換法によるテルライトガラス光導波路の作製と特性評価

    ガラスおよびフォトニクス材料討論会  2011 

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  • Surface Crystallization Behavior of Bismuth Zinc Borate Glasses and Nonlinear Optical Property of Crystallized Glass-Ceramics

    Japan-Korea Ceramics Seminar  2011 

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  • Phosphorus Recovery Process from Iron- and Steel-Making Slag

    Japan-Korea Ceramics Seminar  2011 

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  • Effect of TiO2 on the Distribution of Phosphorus due to Phase Separation of Borosilicate Glass

    Japan-Korea Ceramics Seminar  2011 

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  • Preparation and Properties of Tin Phosphate Glass

    Japan-Korea Ceramics Seminar  2011 

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  • 交番電場を利用したガラスの分相組織および分相組成の制御

    ヤングセラミストミーティングin中四国  2011 

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  • Phosphorus Recycling from Sewage Sludge

    Japan-Korea Ceramics Seminar  2011 

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  • Distribution Behavior of Inorganic Constituents in Municipal Waste Slags due to Phase Separation of Vitrified Slags

    Japan-Korea Ceramics Seminar  2011 

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  • Distribution of Transition Metal Ions Associated with Phase Separation in Na2O-CaO-B2O3-SiO2 Glass System

    Japan-Korea Ceramics Seminar  2011 

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  • Structural Investigation of Bismuth Borate Glasses Containing Halides

    Japan-Korea Ceramics Seminar  2011 

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  • Construction and Utilization of XPS Structural Data of Glasses

    Japan-Korea Ceramics Seminar  2011 

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  • Bi系新規蛍光体の開発

    ヤングセラミストミーティングin中四国  2011 

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  • EDTAを用いた湿式ボールミル法による有価元素の回収

    ヤングセラミストミーティングin中四国  2011 

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  • MgO-Al2O3系耐火物への非酸化物添加効果

    ヤングセラミストミーティングin中四国  2011 

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  • ハロゲン含有重金属酸化物ガラスの電子状態解析

    ヤングセラミストミーティングin中四国  2011 

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  • 電界イオン交換法による光導波路の作製と特性評価

    ヤングセラミストミーティングin中四国  2011 

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  • ボロシリケート系ガラスの構造予測に関する研究

    ヤングセラミストミーティングin中四国  2011 

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  • 逆モンテカルロ法と分子動力学法を用いた重金属酸化物ガラスの構造モデル構築

    ヤングセラミストミーティングin中四国  2011 

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  • ガラスの相分離現象を利用した無機系廃棄物のケミカルリサイクル

    日本セラミックス協会秋季シンポジウム  2011 

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  • スズリン酸塩系ガラスの作製および特性評価

    日本セラミックス協会秋季シンポジウム  2011 

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  • ガラスと分光法

    ガラス部会若手セミナー  2011 

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  • Phase separation of borosilicate glass containing phosphorus

    Pacrim9  2011 

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  • 高温X 線回折を用いたフレスノイト組成を有するガラスの結晶化過程の解析

    ガラスおよびフォトニクス材料討論会  2011 

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  • ガラスのXPS 構造情報のデータベース化および重回帰分析の利用

    ガラスおよびフォトニクス材料討論会  2011 

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  • ガラスの特性を利用した無機系廃棄物のケミカルリサイクル

    日本セラミックス協会秋季シンポジウム  2011 

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  • 超音波表面処理によるBi2O3-ZnO-B2O3系ガラスの結晶化制御

    日本セラミックス協会秋季シンポジウム  2011 

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  • 鉛代替ガラス

    ガラス科学技術研究会  2011 

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  • Er3+ドープAg+-Na+電界イオン交換タングステンテルライトガラス光導波路の光学特性評価

    セラミックス基礎科学討論会  2011 

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  • スズリン酸塩系ガラスの作製及び特性評価

    セラミックス基礎科学討論会  2011 

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  • 重金属酸化物ガラスのMDシミュレーション

    セラミックス基礎科学討論会  2011 

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  • 微生物が作るバイオジナス酸化鉄のキャラクタリゼーション(第2 報)~放射光を用いたアモルファス構造解析~

    セラミックス基礎科学討論会  2011 

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  • フレスノイト表面結晶化における超音波表面処理の透明性と配向性への影響

    セラミックス基礎科学討論会  2011 

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  • 高配向フレスノイト結晶化ガラスの析出形態観察

    セラミックス基礎科学討論会  2011 

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  • ホウケイ酸塩ガラスの分相における添加したリンの分配挙動

    セラミックス基礎科学討論会  2011 

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  • Na2O-CaO-B2O3-SiO2系ガラスの分相に伴う遷移金属元素の分配

    日本セラミックス協会年会  2011 

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  • ビスマス亜鉛ホウ酸塩ガラスの結晶化と非線形光学機能発現

    日本セラミックス協会年会  2011 

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  • エレクトロクロミックWO3 薄膜の着退色特性と挿入イオンの分布状態

    セラミックス基礎科学討論会  2011 

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  • 耐火物の耐スラグ侵食性に及ぼす非酸化物添加効果

    セラミックス基礎科学討論会  2011 

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  • Functional and structural characterizations of fresnoite glass-ceramics oriented with UST technique

    Pacrim9  2011 

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  • Fabrication and characterization of Er3+-doped tellurite glass

    Pacrim9  2011 

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  • Structural study of P2O5-SiO2 binary glasses before and after annealing by 29Si and 31P MAS NMR spectroscopy

    Korea-Japan International Seminar on Ceramics  2010 

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  • 耐火物の耐スラグ侵食性に及ぼす非酸化物添加効果

    耐火物技術協会年次講演会  2010 

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  • Er3+ドープAg+-Na+イオン交換タングステンテルライトガラス光導波路の屈折率分布および伝播損失

    日本セラミックス協会年会  2010 

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  • Coloration and Depth Distribution of Cations Electrochemically-inserted into Electrochromic WO3 Thin Films

    International Conference of Ceramics  2010 

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  • Effect of Ultrasonic Surface Treatment on the Transparency and Orientation of Fresnoite Surface Crystallization

    International Conference of Ceramics  2010 

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  • Structural Investigation Of Bismuth Borate Glasses Containing Halides

    International Conference of Ceramics  2010 

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  • Structural study of P2O5-SiO2 binary glasses before and after annealing by 29Si and 31P MAS NMR spectroscopy

    Korea-Japan International Seminar on Ceramics  2010 

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  • Effect of Addition of Non-oxides on the Slag Corrosion Resistance of MgO-Al2O3 Refractories

    International Conference of Ceramics  2010 

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  • Fabrication and Characterization of Er3+-doped Tellurite Glass Waveguides by Ag+-Na+ Ion-exchange Method

    International Conference of Ceramics  2010 

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  • Phase separation of borosilicate glass containing phosphorus

    International Conference of Ceramics  2010 

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  • 高配向フレスノイト結晶化ガラスの析出形態観察

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • CaO-B2O3-SiO2系ガラスの分相に伴う添加成分の分配

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • アルカリ土類ビスマスホウ酸塩ガラスの結晶化と非線形光学機能発現

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • セラミックス材料の塩基度と反応性

    耐火物技術協会,精錬・鋳造用耐火物専門委員会  2010 

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  • スズリン酸塩系ガラスの作製及び特性評価

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • Structural analysis of bismuth zinc borate glasses using high energy X-ray diffraction and 11B MAS NMR measurements

    International Congress on Glasses  2010 

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  • Coloration and Depth Distribution of Cations Electrochemically-inserted into Electrochromic WO3 Thin Films

    International Conference of Ceramics  2010 

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  • Effect of Ultrasonic Surface Treatment on the Transparency and Orientation of Fresnoite Surface Crystallization

    International Conference of Ceramics  2010 

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  • Molecular Dynamics Simulation of Lead Borate and Related Glasses in Multicomponent Systems for Low Melting Vitrification of Nuclear Wastes

    International Conference of Ceramics  2010 

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  • Effect of Addition of Non-oxides on the Slag Corrosion Resistance of MgO-Al2O3 Refractories

    International Conference of Ceramics  2010 

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  • Fabrication and Characterization of Er3+-doped Tellurite Glass Waveguides by Ag+-Na+ Ion-exchange Method

    International Conference of Ceramics  2010 

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  • Phase separation of borosilicate glass containing phosphorus

    International Conference of Ceramics  2010 

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  • Structural Investigation Of Bismuth Borate Glasses Containing Halides

    International Conference of Ceramics  2010 

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  • ビスマスホウ酸塩系ガラスの構造解析

    基礎科学討論会  2010 

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  • 近赤外レーザー誘起によるDy3+含有ビスマス亜鉛ホウ酸塩ガラスの局所結晶化

    基礎科学討論会  2010 

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  • Structural analysis of bismuth zinc borate glasses using high energy X-ray diffraction and 11B MAS NMR measurements

    International Congress on Glasses  2010 

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  • セラミックス材料のX線光電子分光データベースの構築及び測定により求めた内殻準位の化学シフトの回帰分析

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • 逆モンテカルロ法による重元素含有ホウ酸塩ガラスのモデル構築

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • ホウ素の循環再利用プロセスの開発

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • 湿式ボールミル法による希土類含有廃棄物からの希土類元素の回収

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • 下水処理汚泥からのリンの回収プロセス

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • ステンレス成分が廃棄物からのSiO2回収に与える影響の評価

    日本セラミックス協会ヤングセラミストミーティングin中四国  2010 

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  • 耐火物と溶融スラグの反応性に及ぼす塩基度の影響

    日本セラミックス協会年会  2010 

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  • 廃棄物の再資源化処理プロセスの開発

    基礎科学討論会  2010 

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  • エレクトロクロミックWO3薄膜の着退色特性と挿入イオンの分布状態

    基礎科学討論会  2010 

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  • 硫黄を含むガラスの分相と硫黄の挙動

    基礎科学討論会  2010 

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  • Molecular Dynamics Simulation of Lead Borate and Related Glasses in Multicomponent Systems for Low Melting Vitrification of Nuclear Wastes

    International Conference of Ceramics  2010 

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  • 低融点ビスマスボレートガラスの構造解析

    日本セラミックス協会年会  2009 

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  • 重金属系ガラス中のハロゲンの存在状態とダイナミックス

    ヤングセラミストミーティングin中四国  2009 

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  • 硫黄を含むガラスの分相と硫黄の挙動

    西日本大会  2009 

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  • 種々のセラミックス材料の電子状態と離型性

    ヤングセラミストミーティングin中四国  2009 

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  • 純テルライトおよび低アルカリテルライトガラスの特異な結晶化挙動の観察

    ヤングセラミストミーティングin中四国  2009 

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  • ホウケイ酸塩系ガラスの分相におけるリンの分配挙動

    ヤングセラミストミーティングin中四国  2009 

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  • 配向したフレスノイト結晶化ガラスの酸溶解と針状単結晶の単離

    ヤングセラミストミーティングin中四国  2009 

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  • 湿式ボールミルによる産業廃棄物からの有価元素の回収

    ヤングセラミストミーティングin中四国  2009 

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  • ホウ素の循環再利用プロセスの開発

    ヤングセラミストミーティングin中四国  2009 

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  • 鉄鋼スラグからのリンのリサイクル

    ヤングセラミストミーティングin中四国  2009 

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  • ビスマスホウ酸塩系ガラスの構造解析と分相挙動との関連

    ガラスおよびフォトニクス材料討論会  2009 

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  • 硫黄を含むガラスの分相と硫黄の挙動

    日本セラミックス協会年会  2009 

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  • WO3薄膜へ電気化学的に挿入されたイオンの分布状態

    日本セラミックス協会年会  2009 

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  • 耐火物と溶融スラグの反応性に及ぼす塩基度の影響

    日本セラミックス協会年会  2009 

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  • 産業廃棄物の再資源化処理プロセスの開発

    日本セラミックス協会年会  2009 

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  • 高度配向したフレスノイト結晶化ガラスの透明性向上と機能評価

    秋季シンポジウム  2009 

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  • 耐火物の耐スラグ侵食性に及ぼす非酸化物の添加効果

    秋季シンポジウム  2009 

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  • 近赤外レーザー誘起によるDy3+含有ビスマス亜鉛ホウ酸塩ガラスの局所結晶化

    日本セラミックス協会年会  2009 

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  • 無機系廃棄物の再資源化技術の開発

    日本セラミックス協会年会  2008 

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  • バルク状高配向透明結晶化ガラスの開発

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • Crフリーレンガの開発(耐スラグ浸食性に対する非酸化物添加効果)

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • 湿式ボールミルによる廃棄物のリサイクル法の開発

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • ホウ素の循環再利用プロセスの開発

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • WO3エレクトロクロミック(EC)薄膜の着退色機構の解明

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • イオン交換に伴うガラスの構造変化の解析

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • レーザー集光局所加熱を利用したガラス表面への異質相パターニング

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • ZnO含有低融点ガラスの構造解析とガラス中のハロゲンの存在状態の解明

    日本セラミックス協会中国四国支部ヤングセラミストミーティング  2008 

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  • Er3+ドープAg+-Na+イオン交換タングステンテルライトガラス導波路の屈折率分布および伝搬損失

    日本セラミックス協会ガラス部会ガラス討論会  2008 

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  • アルミノボロシリケートガラスの構造に及ぼす塩基度の影響

    日本セラミックス協会ガラス部会ガラス討論会  2008 

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  • Behavior of sulfur associated with phase separation of glass in Na2S-B2O3-SiO2 system

    6th International Conference on Inorganic Materials  2008 

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  • 無機系廃棄物の再資源化技術の開発

    日本セラミックス協会基礎科学討論会  2008 

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  • バルク状高配向表面結晶化ガラスの析出形態制御と機能発現

    日本セラミックス協会年会  2008 

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  • 分子軌道計算によるSi NMR化学シフトに対するホウ素の影響評価

    日本セラミックス協会年会  2008 

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  • 酸化物ガラス中のEr3+イオンの光学特性とガラスの塩基度との相関

    The 18th Meeting on Glasses for Photonics  2008 

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  • Si NMR 化学シフトに対するホウ素の影響評価

    日本セラミックス協会基礎科学討論会  2008 

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  • 耐火物の反応性に及ぼす塩基度の影響

    日本セラミックス協会年会  2008 

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  • 耐火物の反応に及ぼす塩基度の影響

    日本セラミックス協会秋季シンポジウム  2008 

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  • Molecular orbital calculation of 29Si NMR chemical shift in borosilicates --- the effect of boron coordination to SiO4 unit ---

    Borate Conference 2008  2008 

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  • Correlation between basicity and coordination structure in borosilicate glasses

    Borate Conference 2008  2008 

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  • ガラスにおける化学結合状態と塩基度

    日本セラミックス協会ガラス部会若手セミナー  2008 

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  • Effect of basicity on the reactivity of refractories

    6th International Conference on Inorganic Materials  2008 

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  • Effect of basicity on the structure of aluminoborate glasses

    6th International Conference on Inorganic Materials  2008 

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  • Fabrication and Characterization Of Er3+-doped Tellurite Glass Waveguides By Ag+-Na+ Ion-exchange Method

    6th International Conference on Inorganic Materials  2008 

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  • 一般廃棄物のケミカルリサイクル

    日本セラミックス協会秋季シンポジウム  2008 

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  • 一般廃棄物高温焼却炉用クロムフリー耐火物の開発

    耐火物技術協会年次学術講演会  2008 

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  • Studies on the Characterization of Sulfur and Coloration in Borosilicate Glasses

    Pacrim7  2007 

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  • 都市ゴミ焼却灰と溶融スラグの再資源化処理プロセスの開発

    ヤングセラミストミーティングin中国四国  2007 

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  • 産業廃棄物の再資源化処理プロセスの開発

    ヤングセラミストミーティングin中国四国  2007 

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  • 耐火物の反応性に及す塩基度の影響

    ヤングセラミストミーティングin中国四国  2007 

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  • 29Si及び31P MAS NMR 分光法によるアニール前後のP2O5-SiO2 二成分系ガラスの構造解析

    ガラスおよびフォトニクス材料討論会  2007 

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  • バルク状高配向表面結晶化ガラスの析出形態制御と機能発現

    ヤングセラミストミーティングin中国四国  2007 

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  • 硫黄を含むガラスの分相と硫黄の挙動

    ヤングセラミストミーティングin中国四国  2007 

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  • 陶磁器用鉛フリーガラスの開発

    ヤングセラミストミーティングin中国四国  2007 

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  • ガラスの分相を利用した都市ゴミ溶融スラグのマテリアルサイクル

    ヤングセラミストミーティングin中国四国  2007 

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  • ガラス構造の予測手法の開発-塩基度がガラス構造に及ぼす影響評価-

    ヤングセラミストミーティングin中国四国  2007 

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  • 酸化物ガラス中のEr3+イオンの光学特性とガラスの塩基度との相関

    ヤングセラミストミーティングin中国四国  2007 

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  • アルミノボレートガラスの構造に及ぼす塩基度の影響

    ガラスおよびフォトニクス材料討論会  2007 

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  • 応力場変調による光非線形変調構造の形成

    ヤングセラミストミーティングin中国四国  2007 

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  • 分子軌道計算による29SiNMR 化学シフトの定量的評価

    ヤングセラミストミーティングin中国四国  2007 

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  • イオン交換に伴う構造変化の解析

    ヤングセラミストミーティングin中国四国  2007 

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  • Ag+-Na+イオン交換法によるEr3+ドープテルライトガラス光導波路の作製および特性評価

    ヤングセラミストミーティングin中国四国  2007 

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  • 分子軌道計算による29Si NMR 化学シフトの定量的評価

    日本化学会西日本大会  2007 

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  • ガラスの相分離を利用した廃棄物の新規リサイクル法

    日本セラミックス協会秋季シンポジウム  2007 

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  • ガラスの相分離を利用した廃棄物のマテリアルリサイクル

    日本セラミックス協会中国四国支部 第2回 産学官研究マッチング  2007 

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  • 都市ゴミ溶融スラグのマテリアルリサイクル

    日本化学会西日本大会  2007 

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  • ガラス構造の予測手法の開発-塩基度がガラス構造に及ぼす影響評価-

    日本化学会西日本大会  2007 

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  • Ag+-Na+イオン交換法によるEr3+含有タングステンテルライトガラス光導波路の作製および特性評価

    日本化学会西日本大会  2007 

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  • 酸化物ガラス中のEr3+イオンの光学特性とガラスの塩基度との相関

    日本化学会西日本大会  2007 

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  • Ag+-Na+イオン交換法によるEr3+含有テルライトガラス光導波路の作製及び特性評価

    ガラスおよびフォトニクス材料討論会  2007 

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  • MAS NMR分光法によるアニール前後のP2O5-SiO2 二成分系ガラスの構造解析

    日本セラミックス協会年会  2007 

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  • ボロシリケートガラス中トライクラスター酸素の17ONMR パラメータ解析

    日本セラミックス協会基礎科学討論会  2007 

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  • TiO2 含有酸化物ガラスの構造解析

    日本セラミックス協会基礎科学討論会  2007 

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  • Ab-initio calculation of 17O NMR parameters of various oxygen sites in borosilicate glasses

    International Congress on Glass XXI  2007 

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  • New recycling method of industrial and nonindustrial waste slags using phase separation of glass

    International Congress on Glass XXI  2007 

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  • ボロシリケートガラスの構造に及ぼす塩基度の影響

    日本セラミックス協会年会  2007 

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  • 廃棄物溶融炉用耐火物の断熱性に及ぼす組成と組織の影響

    日本セラミックス協会,年会,サテライトプログラム  2006 

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  • テルライト系ガラスの屈折率の組成依存性

    日本セラミックス協会,基礎科学討論会  2006 

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  • 分子軌道計算によるボロシリケートガラスの17O NMRパラメーターの解析

    日本セラミックス協会,基礎科学討論会  2006 

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  • 2価カチオンを挿入した非晶質WO3薄膜のエレクトロクロミック特性

    日本セラミックス協会,基礎科学討論会  2006 

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  • 廃棄物溶融炉用MgO-Al2O3系の反応性に対する添加物の影響

    日本セラミックス協会,基礎科学討論会  2006 

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  • Influence of the Composition and Microstructure on Property of the Al2O3-Cr2O3 Refractory Materials

    1st International Congress On Ceramics  2006 

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  • 分子軌道計算によるリン酸塩ガラス化学結合状態の解析

    日本セラミックス協会中国四国支部ヤングセラミストミーティングin中国四国  2006 

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  • Ab Initio Calculation of 17O NMR Parameter of Oxygen Sites in Borosilicate Glasses

    IMA2006  2006 

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  • Molecular Orbital Calculation on the Chemical Bonding Character of Phosphate Glasses

    Materials Science & Technology 2006  2006 

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  • Structure and Optical Properties of TiO2 Containing Oxide Glasses

    Materials Science & Technology 2006  2006 

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  • Ab Initio Calculation of 17O NMR Parameters of Tricluster Oxygen Sites in Borosilicate Glasses

    Materials Science & Technology 2006  2006 

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  • 一般廃棄物溶融スラグの新規リサイクル法

    日本セラミックス協会,秋季シンポジウム  2006 

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  • 分子軌道計算によるリン酸塩ガラスの化学結合性の評価

    日本セラミックス協会ガラスおよびフォトニクス材料討論会  2006 

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  • Regression Analysis on the Amount of Tetrahedral Boron in Borosilicate Glasses

    Materials Science & Technology 2006  2006 

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  • Correlation between the Basicity and Optical Property of Er3+ Ion in Oxide Glasses

    Materials Science & Technology 2006  2006 

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  • Recycling of Municipal Waste Slag Using Phase Separation of Glass

    Materials Science & Technology 2006  2006 

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  • 酸化物ガラス中のErイオンの光学特性と塩基度の相関

    日本セラミックス協会ガラスおよびフォトニクス材料討論会  2006 

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  • 酸化物ガラス中のEr3+イオンの光学物性とガラスマトリックスの塩基度との相関

    日本セラミックス協会中国四国支部ヤングセラミストミーティングin中国四国  2006 

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  • ボロシリケートガラス中トライクラスターの分子軌道計算

    日本セラミックス協会中国四国支部ヤングセラミストミーティングin中国四国  2006 

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  • TiO2含有酸化物ガラスの光学特性と構造解析

    日本セラミックス協会中国四国支部ヤングセラミストミーティングin中国四国  2006 

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  • Ag+-Na+イオン交換法によるEr3+ドープテルライトガラス平面導波路の光学特性とイオン交換条件との関係

    日本セラミックス協会年会  2005 

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  • Optical Properties of Bi2O3-La2O3-Al2O3-B2O3 Glasses

    Pacrim6  2005 

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  • Compositional Dependence of Refractive Index in Tellurite Glasses

    Pacrim6  2005 

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  • Chemical Bonding Character of the Network Forming Bonds in Oxide Glasses

    Pacrim6  2005 

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  • Optical properties of waveguides of Er3+-doped tellurite glasses prepared by Ag+-Na+ ion-exchange

    Pacrim6  2005 

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  • Theoretical Interpretation of 17O NMR Spectra in Borosilicate Glasses

    Pacrim6  2005 

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  • Bi2O3-ZnO-Al2O3系ガラスの作製と透明着色結晶の形成

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2005 

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  • Er3+ドープ酸化物ガラスの1.5μm帯発光幅とガラスマトリックスの塩基度との相関

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2005 

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  • 重金属酸化物ガラス中の希土類イオンの発光特性

    日本セラミックス協会,ガラスおよびフォトニクス材料討論会  2005 

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  • ビスマス含有ガラスの構造と赤外発光特性

    日本セラミックス協会,ガラスおよびフォトニクス材料討論会  2005 

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  • Ag+-Na+イオン交換法により作製したEr3+含有光導波ガラスの光学特性

    日本セラミックス協会基礎科学討論会  2005 

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  • Na2O-GeO2ガラスおよび結晶の化学結合状態

    日本セラミックス協会基礎科学討論会  2005 

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  • リン酸塩結合材を用いた耐火物用パッチング材の硬化機構の解明

    日本セラミックス協会年会  2005 

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  • ゾルゲル法により作製したAl2O3-Cr2O3の焼結性と化学的特性

    日本セラミックス協会年会  2005 

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  • 廃棄物溶融炉用MgO-Al2O3系スピネルの組成と作製法の検討

    日本セラミックス協会年会  2005 

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  • Tm含有重金属酸化物ガラスの光学特性

    日本セラミックス協会基礎科学討論会  2005 

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  • テルライト系ガラスの屈折率の組成依存性

    日本セラミックス協会年会  2005 

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  • TiO2含有酸化物ガラスの光学特性と構造解析

    日本セラミックス協会年会  2005 

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  • 分子軌道計算によるボロシリケートガラスの17O NMR 化学シフトの解析

    日本セラミックス協会年会  2005 

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  • Optical properties of rare earth ions in heavy metal oxide glasses

    Pacrim6  2005 

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  • Sintering and chemical properties of Al2O3-Cr2O3 ceramics prepared by sol-gel process

    Pacrim6  2005 

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  • Al2O3-Cr2O3系セラミックスの化学的特性

    日本材料学会,第117回セラミック材料部門委員会  2005 

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  • リン酸塩結合材を用いたパッチング耐火物の硬化機構

    日本材料学会,第117回セラミック材料部門委員会  2005 

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  • Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations

    Pacrim6  2005 

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  • Sr-Akermanite系ガラスセラミクスの残光特性

    日本セラミックス協会・基礎科学討論会  2004 

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  • WO3エレクトロクロミック薄膜の作製

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2004 

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  • Erドープ光ファイバーアンプの作製

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2004 

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  • Cr2O3-Al2O3系焼結体の焼結性

    耐火物技術協会,連合研究発表会  2004 

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  • CATION DISTRIBUTION IN ALKALI AND ALKANINE-EARTH BOROSILICATE GLASSES

    XX International Congress on Glass  2004 

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  • 鉛代替ガラスとしてのTiO2含有ガラスの作製とその光学特性

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2004 

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  • 重金属酸化物ガラス中のPr3+イオンの光学特性

    日本セラミックス協会,ヤングセラミストミーティングin中四国  2004 

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  • STRUCTURE OF Bi2O3-SiO2 GLASSES

    XX International Congress on Glass  2004 

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  • CHEMICAL BONDING CHARACTER OF ALUMINOSILICATE GLASSES

    XX International Congress on Glass  2004 

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  • テルライト系ガラスの屈折率の組成依存性

    日本セラミックス協会,支部連合学術討論会  2004 

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  • 一般廃棄物焼却炉用クロムフリー耐火材料の開発

    日本セラミックス協会,支部連合学術討論会  2004 

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  • イオン交換法による銀イオン含有光導波ガラスの作製

    日本セラミックス協会・基礎科学討論会  2004 

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  • アルカリホウ酸塩結晶の配位環境と電子状態

    日本セラミックス協会・基礎科学討論会  2004 

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  • 2価イオン挿入による非晶質WO3薄膜のエレクトロクロミック特性

    日本セラミックス協会・基礎科学討論会  2004 

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  • Bi2O3-GeO2-B2O3系ガラス及びガラスセラミックス中のCrイオンの光学特性

    日本セラミックス協会・基礎科学討論会  2004 

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  • Er3+ドープテルライトガラスのAg+-Na+イオン交換法による平面導波路の光学特性評価

    日本セラミックス協会,支部連合学術討論会  2004 

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  • ビスマス系酸化物ガラスの化学状態と光学特性

    日本材料学会, 第53期学術講演会  2004 

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  • ビスマス系酸化物ガラスの屈折率と分散

    日本材料学会, 第53期学術講演会  2004 

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  • アルカリホウ酸塩結晶の配位環境と電子状態

    日本セラミックス協会・年会  2003 

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  • Ag+-Na+イオン交換法によるEr3+ドープテルライトガラス光導波路作製およびその導波特性

    セラミックス協会・ガラスおよびフォトニクス材料討論会  2003 

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  • Molecular dynamic simulation on the structure of sodium germanate melts

    Pacrim5  2003 

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  • Defect structures in lithium bismuthate glass

    Pacrim5  2003 

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  • An interpretation of 11B and 29Si NMR spectra in alkali borosilicate glasses

    Goldschmidt 2003  2003 

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  • Er3+含有重金属酸化物ガラスの光学特性

    セラミックス協会・ヤングセラミストミーティングin中国四国  2003 

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  • GeO2系融体の分子動力学シミュレーション

    セラミックス協会・ガラスおよびフォトニクス材料討論会  2003 

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  • アルカリ土類ホウ珪酸塩ガラスの化学結合状態

    セラミックス協会・ガラスおよびフォトニクス材料討論会  2003 

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  • アルカリボロシリケートガラスのNMRスペクトル

    セラミックス協会・ガラスおよびフォトニクス材料討論会  2003 

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  • 電位差滴定法によるセラミック粉体の表面状態の評価

    日本セラミックス協会・支部連合学術講演会  2003 

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  • Changes in atomic and electronic structures of amorphous WO3 films due to electrochemical ion insertion

    3rd International Symposium on Transparent Oxide Thin Films for Electronics and Optics  2003 

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  • 分子動力学法によるアルカリゲルマン酸塩ガラスおよび融体の構造シミュレーション

    セラミックス協会・ヤングセラミストミーティングin中国四国  2003 

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  • アルカリホウ酸塩結晶の配位環境と電子状態

    セラミックス協会・ヤングセラミストミーティングin中国四国  2003 

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  • 重金属酸化物を含むガラス中の遷移金属イオン

    日本セラミックス協会・基礎科学討論会  2003 

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  • 長残光性透明ガラスセラミックスの作製

    日本セラミックス協会・基礎科学討論会  2003 

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  • アルカリ土類ホウ酸塩ガラスの化学結合状態

    日本セラミックス協会・年会  2003 

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  • Er含有重金属酸化物ガラスの光学特性

    日本セラミックス協会・年会  2003 

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  • Ag+-Na+イオン交換法で作成したEr3+ドープテルライトガラス光導波路の光学特性

    日本セラミックス協会・年会  2003 

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  • アルカリホウ珪酸塩ガラスの化学結合状態

    日本セラミックス協会・基礎科学討論会  2003 

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  • 分子動力学シミュレーションによる三体ポテンシャルの効果

    日本セラミックス協会第40回基礎科学討論会  2002 

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  • 非晶質WO3薄膜への2価カチオンインターカレーションとその物性

    日本セラミックス協会第40回基礎科学討論会  2002 

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  • 長残光を示すガラスセラミックスの作製

    ヤングセラミストミーティング中国四国  2002 

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  • R2O-B2O3-SiO2 ガラスの化学結合状態

    日本セラミックス協会年会  2002 

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  • クロム含有重金属酸化物ガラスの光学特性

    日本セラミックス協会年会  2002 

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  • 紫外光照射によるZn2+添加GeO2-SiO2系非晶質薄膜の光化学反応

    日本セラミックス協会第40回基礎科学討論会  2002 

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  • 紫外光照射によるZn2+添加GeO2-SiO2系非晶質薄膜の光化学反応

    日本セラミックス協会基礎科学討論会  2002 

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  • Spectral properties of erbium-doped HMO glasses for 1.5um broadband amplification

    ISPG2002  2002 

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  • アルカリホウ酸塩結晶の配位環境と電子状態

    DV-Xa研究会  2002 

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  • Electronic and atomistic structures of borosilicate glass

    Borate IV  2002 

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  • ビスマスシリケートガラスの構造と電子状態

    日本セラミックス協会年会  2002 

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  • ガラス及びガラスセラミックス中のCrイオンの光学特性

    ヤングセラミストミーティング中国四国  2002 

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  • ビスマスシリケートガラスの化学構造

    ガラス討論会  2002 

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  • アルカリ土類ホウケイ酸塩系ガラスの化学結合状態

    ヤングセラミストミーティング中国四国  2002 

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  • アルカリホウ酸塩結晶の配位環境と電子状態

    ヤングセラミストミーティング中国四国  2002 

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  • アルカリ硼珪酸塩ガラスの化学構造

    日本セラミックス協会中国四国支部第8回ヤングセラミストミーティングin中四国  2001 

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  • ガラスセラミックス蛍光体における超音波処理効果

    日本セラミックス協会年会  2001 

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  • An interpretation in chemical shifts of core-level XPS signals in oxide glasses

    Pacrim 4  2001 

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  • Er3+添加重金属酸化物ガラスの光学特性

    日本セラミックス協会第42回ガラスおよびフォトニクス材料討論会  2001 

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  • アルカリ土類アルミノホウ酸塩ガラスの化学構造

    日本セラミックス協会第42回ガラスおよびフォトニクス材料討論会  2001 

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  • Bi系重金属酸化物ガラスの構造と特性

    日本セラミックス協会中国四国支部第8回ヤングセラミストミーティングin中四国  2001 

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  • Ti3+を用いたチューナブルガラスレーザーの開発

    日本セラミックス協会中国四国支部第8回ヤングセラミストミーティングin中四国  2001 

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  • ガラスマトリックス中の塩基度とクロムイオンの化学状態の相関性

    日本セラミックス協会中国四国支部第8回ヤングセラミストミーティングin中四国  2001 

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  • Changes in atomic and electronic structure of amorphous WO3 films due to electrochemical ion insertion

    Pacrim 4  2001 

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  • X-ray photoelectron spectroscopy of sodium borosilicate glasses

    ICG19  2001 

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  • アルカリホウ珪酸塩ガラスのX線光電子スペクトル

    日本セラミックス協会第39回基礎討論会  2001 

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  • 紫外光照射によるZn2+添加GeO2-SiO2系非晶質薄膜の光化学反応

    日本セラミックス協会基礎科学討論会  2001 

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  • 非晶質WO3薄膜へのZn2+イオンインターカレーションとその物性

    日本セラミックス協会支部連合学術講演会  2001 

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  • XPS and DV-Xa studies on the electronic structure of silicate glasses

    International Workshop on DV-Xa  2001 

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  • シリカ系ガラスへの高い光非線形性の付与

    日本セラミックス協会中国四国支部第7回ヤングセラミストミーティングin中四国  2000 

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  • WO3‐TeO2系ガラスの電子状態と光学物性

    日本セラミックス協会中国四国支部第7回ヤングセラミストミーティングin中四国  2000 

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  • TeO2-BiO1.5系ガラス中の希土類イオンの光学特性

    日本セラミックス協会第41回ガラスおよびフォトニクス材料討論会  2000 

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  • ゾル-ゲル法によるアルミナ-マグネシア系粉体の作製とその性質

    日本セラミックス協会中国四国支部第7回ヤングセラミストミーティングin中四国  2000 

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  • リチウム-ビスマス2成分系酸化物ガラスの構造と電子状態の関連について

    日本セラミックス協会第41回ガラスおよびフォトニクス材料討論会  2000 

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  • ガラスの結晶化におけるマイクロ波照射効果

    日本セラミックス協会基礎科学討論会  2000 

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  • 分相ガラスにドープされた希土類イオンの発光特性

    日本セラミックス協会基礎科学討論会  2000 

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  • 希土類イオンドープ結晶化ガラスの光学特性

    日本セラミックス協会基礎科学討論会  2000 

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  • 非晶質WO3薄膜の構造と電子状態

    日本セラミックス協会基礎科学討論会  2000 

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  • WO3-TeO2系ガラスの電子状態

    日本セラミックス協会基礎科学討論会  2000 

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  • Bi2O3-B2O3系ガラスの構造と電子状態

    2000 

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  • アルカリ土類アルミノホウ酸塩ガラスの化学構造

    日本セラミックス協会第13回秋季シンポジウム  2000 

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  • ガラスの表面結晶化によるSr2TiSi2O8膜の作製と光学特性

    日本セラミックス協会年会  2000 

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  • XPSによる重金属含有ガラスの電子状態解析

    日本セラミックス協会年会  2000 

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  • ほう酸ガラス中の硫黄の状態分析

    日本セラミックス協会年会  1999 

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  • リチウムビスマス系酸化物ガラスの構造について

    日本セラミックス協会年会  1999 

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  • ガラスの結晶化におけるマイクロ波照射効果

    日本セラミックス協会ヤングセラミストミーティングin中国四国  1999 

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  • 硫黄含有ホウケイ酸ガラスの局所構造と電子状態

    日本セラミックス協会秋季シンポジウム  1999 

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  • X線光電子分光法及び分子軌道計算によるアルカリ珪酸塩ガラスの電子状態

    日本セラミックス協会秋季シンポジウム  1999 

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  • 分子動力学法によるホウ酸塩系ガラスの構造シミュレーション

    日本セラミックス協会秋季シンポジウム  1999 

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  • ZnO-B2O3-SiO2系ガラスのフォトクロミック特性

    日本セラミックス協会年会  1999 

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  • 二成分系テルライトガラスの局所構造と電子状態

    日本セラミックス協会ガラスおよびフォトニクス材料討論会  1999 

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  • XPSによるNa2O-B2O3-SiO2系ガラスの電子状態解析

    日本セラミックス協会ガラスおよびフォトニクス材料討論会  1999 

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  • リチウムビスマス系酸化物ガラスの構造解析

    日本セラミックス協会秋季シンポジウム  1999 

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  • Na2O-TiO2-SiO2系ガラスの局所構造

    日本セラミックス協会秋季シンポジウム  1999 

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  • 分相ガラス中にドープされた希土類イオンの発光特性

    日本セラミックス協会ヤングセラミストミーティングin中国四国  1999 

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Awards

  • フェロー

    2021.6   日本セラミックス協会  

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  • 査読貢献賞

    2018.3   日本セラミックス協会  

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  • 耐火物技術協会若林賞

    2012  

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    Country:Japan

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  • 協会賞(学術賞)

    2011   日本セラミックス協会  

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  • Award of the Outstanding Papers Published in the Journal of The Ceramic Society of Japan in 1998

    1999  

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  • Young Scientists Award

    1995   Ceramic Society of Japan  

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    Country:Japan

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