Faculty Profiles - SAKIDA Shinichi

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

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

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

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

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

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

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

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

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

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

鉄鋼スラグからのリンの回収プロセスの開発

河西宏樹, 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 50th 2012

難波徳郎, 崎田真一, 紅野安彦

Phosphorus letter ( 70 ) 27 - 34 2011.2

MgO-Al₂O₃スピネルの耐スラグ侵食性におよぼす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

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

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

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

Language：English

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

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

Miho Kawai, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

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

Language：English Publisher：IOP PUBLISHING LTD

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

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

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

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

Language：English

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

Phase separation of borosilicate glass containing phosphorus

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

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

Language：English

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

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

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

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

Language：English

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

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

Keisuke Morita, Shinichi Sakida, Yasuhiko Benino, Tokuro Nanba

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

Language：English 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

Material recycling of inorganic slag by wet ball milling Reviewed

33 ( 33 ) 6 - 12 2011

Na₂O-CaO-B₂O₃-SiO₂系ガラスの分相に伴う遷移金属元素の分配

大野愛美, 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 2011 2011

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

Language：English 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

Effect of Addition of Non-oxides to Refractories on the Slag Corrosion Resistance

MORITA Keisuke, SAKIDA Shinichi, BENINO Yasuhiko, NANBA Tokuro

62 ( 3 ) 122 - 122 2010.3

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

Language：English Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

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.

DOI： 10.2109/jcersj2.117.1195

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

Language：English Publisher：SOC GLASS TECHNOLOGY

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.

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

Language：English Publisher：SOC GLASS TECHNOLOGY

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.