研究者詳細 - 難波　徳郎

論文 - 難波　徳郎

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PHOTOCHROMIC PROPERTIES OF CD-CONTAINING GLASSES 査読

Y MIURA, J FU, A OSAKA, T NANBA

JOURNAL OF NON-CRYSTALLINE SOLIDS 178 64 - 68 1994年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

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.

COORDINATION CHANGE OF TE ATOMS IN BINARY TELLURITE GLASSES 査読

Y HIMEI, A OSAKA, T NANBA, Y MIURA

JOURNAL OF NON-CRYSTALLINE SOLIDS 177 164 - 169 1994年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

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 <-> 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.

CDTE MICROCRYSTALLITES DOPED IN MELT-QUENCHED BOROSILICATE GLASS 査読

J FU, A OSAKA, T NANBA, Y MIURA

JOURNAL OF MATERIALS RESEARCH 9 ( 2 ) 493 - 497 1994年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：MATERIALS RESEARCH SOCIETY

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.

SEGREGATION AND DISSOLUTION REACTIONS OF THE 2223-PHASE IN THE BI, PB-SR-CA-CU-O SYSTEM ON ANNEALING IN AIR

Y KUSANO, T NANBA, J TAKADA, T EGI, Y IKEDA, M TAKANO

PHYSICA C 219 ( 3-4 ) 366 - 370 1994年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

Thermal behavior of the Pb-substituted Bi-2223 phase was examined by characterizing samples annealed at 500 degrees C to 850 degrees C in air and also those subsequently reheated at 850 degrees C in air by XRD, SEM and magnetic measurements. Very interesting reactions occurred, which were segregation of precipitates on annealing below 830 degrees C and dissolution of the precipitates on subsequent reheating at 850 degrees C into the 2223 phase. The precipitates were identified as Sr2.5Bi0.5Pb3Ca2CuOz. The precipitation and the dissolution were clearly confirmed by morphological observations of a fixed portion of a sample before and after heat treatments. These results strongly suggest that the 2223 phase changes its composition reversibly between the relatively Pb-rich composition stabilized above 850 degrees C and relatively Pb-poor ones stabilized in essentially the same structure below 830 degrees C. However, T-c remained almost constant at 113K.

DOI： 10.1016/0921-4534(94)90388-3

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

Yong Ding, Yoshinari Miura, Tokuro Nanba, Akiyoshi Osaka

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

記述言語：英語掲載種別：研究論文（学術雑誌）

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

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

J FU, A OSAKA, T NANBA, Y MIURA

JOURNAL OF MATERIALS SCIENCE LETTERS 12 ( 12 ) 935 - 938 1993年6月

SrO-ZnO-Al_2O_3系ガラスの先着色

博杰, 尾坂明義, 難波徳郎, 三浦嘉也

日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi 101 ( 1169 ) 99 - 101 1993年1月

記述言語：英語出版者・発行元：公益社団法人日本セラミックス協会

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

その他リンク： https://jlc.jst.go.jp/DN/JALC/00370908074?from=CiNii

PHOTOCHROMIC-GLASSES IN THE SYSTEM SRO-ZNO-AL2O3 査読

J FU, A OSAKA, T NANBA, Y MIURA

Journal of the Ceramic Society of Japan 101 ( 1 ) 99 - 101 1993年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

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.

Photochromic glasses in the system SrO-ZnO-Al2O3

Fu Jie, Akiyoshi Osaka, Tokuro Nanba, Yoshinari Miura

Journal of the Ceramic Society of Japan. International ed. 101 ( 1 ) 95 - 97 1993年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

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 470nm (2.64eV) and an ESR signal (77K and 300K) 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.

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

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年

記述言語：英語掲載種別：研究論文（学術雑誌）

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

銀パイプに封入した試料でのＢｉ系高温相の生成

江木俊雄, 細谷勝宣, 難波徳郎, 高田潤

粉体および粉末冶金 40 ( 2 ) 216 - 219 1993年

記述言語：日本語出版者・発行元：Japan Society of Powder and Powder Metallurgy

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

その他リンク： https://jlc.jst.go.jp/DN/JALC/00019482057?from=CiNii

NETWORK STRUCTURE OF RO2B2O3 GLASSES

AKASAKA, Y, YASUI, I, NANBA, T

Physics and Chemistry of Glasses 34 ( 6 ) 1993年

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

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

MATERIALS LETTERS 15 ( 4 ) 264 - 267 1992年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

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.

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

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

JOURNAL OF MATERIALS SCIENCE 27 ( 14 ) 3793 - 3798 1992年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHAPMAN HALL LTD

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 -).

Network Structure of AlF₃-BaF₂-CaF₂ Glass 査読

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年6月

EXAFS OF TELLURIUM IN THE GLASSES OF THE B2O3-TEO2 SYSTEM 査読

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

JOURNAL OF NON-CRYSTALLINE SOLIDS 142 ( 1-2 ) 81 - 86 1992年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

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.

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

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

PHYSICS AND CHEMISTRY OF GLASSES 33 ( 1 ) 12 - 15 1992年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SOC GLASS TECHNOLOGY

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.

Structure and Photochromism of Al-Cd-O-F Glasses 査読

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

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

記述言語：英語掲載種別：研究論文（学術雑誌）

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

超音波噴霧熱分解法によるセラミックス微粒子の合成と微細構造

尾坂明義, 千葉徹, 藤井達生, 難波徳郎, 高田潤, 三浦嘉也

粉体および粉末冶金 39 ( 3 ) 239 - 242 1992年

記述言語：日本語出版者・発行元：Japan Society of Powder and Powder Metallurgy

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

その他リンク： https://jlc.jst.go.jp/DN/JALC/00014076701?from=CiNii

Ｂｉ‐Ｐｂ‐Ｓｒ‐Ｃａ‐Ｃｕ‐Ｏ系高温相へのＬｉ添加効果（第ＩＩ報）

高田潤, 藤原正志, 江木俊雄, 難波徳郎, 池田靖訓, 高野幹夫, 間崎啓匡

粉体および粉末冶金 39 ( 5 ) 386 - 389 1992年

記述言語：日本語出版者・発行元：Japan Society of Powder and Powder Metallurgy

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

その他リンク： https://jlc.jst.go.jp/DN/JALC/00015023896?from=CiNii

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