研究者詳細 - 難波　徳郎

論文 - 難波　徳郎

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大原泰源, 遠藤加寿代, 江木俊雄, 難波徳郎, 高田潤, 池田靖訓, 高野幹夫, 坂東尚周, 間崎啓匡

粉体および粉末冶金 39 ( 5 ) 382 - 385 1992年

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

Effects of the Li-addition to the high-T_c 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. T_c was raised up to 116K for the sample with x=0.03 heated at 840°C for 48h, while a susceptibility measurement revealed that T_c=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-T_c phase with T_c=116K forms on the surface of the high-T_c phase with T_c=110K.

DOI： 10.2497/jjspm.39.382

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00015023889?from=CiNii

Ｌｉ添加Ｂｉ‐Ｐｂ‐Ｓｒ‐Ｃａ‐Ｃｕ‐Ｏ系高温相の生成過程

大原泰源, 伊藤浩之, 高田潤, 藤原正志, 遠藤加寿代, 江木俊雄, 難波徳郎, 池田靖訓, 広井善二, 高野幹夫, 坂東尚周

粉体および粉末冶金 39 ( 9 ) 767 - 770 1992年

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

Li addition was found to raise T_c up to 116K in the high-T_c 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 Bi_0.9Pb_0.2Sr_1.0Ca_1.0Cu_1.6Li_xO_y 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.

DOI： 10.2497/jjspm.39.767

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00016828797?from=CiNii

銀シースＢｉ‐Ｐｂ‐Ｓｒ‐Ｃａ‐Ｃｕ‐Ｏ系超伝導テープ線材の超伝導特性

江木俊雄, 森直元, 細谷勝宣, 難波徳郎, 高田潤

粉体および粉末冶金 39 ( 5 ) 404 - 407 1992年

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

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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その他リンク： https://jlc.jst.go.jp/DN/JALC/00015023919?from=CiNii

Amorphous tantalum and niobium oxide proton conductors derived from respective peroxo polyacids

A. Kishimoto, T. Kudo, T. Nanba

Solid State Ionics 53-56 ( 2 ) 993 - 997 1992年

記述言語：英語掲載種別：研究論文（学術雑誌）

Tantalum and niobium based amorphous solids were prepared by drying respective peroxo polyacids. Peroxo-polytantalate (Ta-IPA) was obtained by a direct reaction of Ta(OC2H5)5 with H2O2, and its Nb-analogue (Nb-IPA) was synthesized by dissolving metallic Nb in H2O2. Niobium carbide also gave a pale yellow solution (Nb-IPA) with H2O2, which had carbon incorporated as a hetero atom. Alternating current electrical conductivity measurements were carried out with pellet samples. Each specimen showed similar temperature dependency indicating its proton conductive mechanism was the same. The conductivity of Ta-IPA solid was larger than those of the others (e.g. 3.9×10-6 S cm-1, 27°C). Conduction mechanisms are discussed i relation to the water content and the structure of these materials. © 1992.

DOI： 10.1016/0167-2738(92)90282-T

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NETWORK STRUCTURE OF ALF3-BAF2-CAF2 GLASS

NANBA, T, OSAKA, A, TAKADA, J, MIURA, Y, INOUE, H, AKASAKA, Y, HAGIHARA, H, YASUI, I

Journal of Non-Crystalline Solids 140 ( 1-3 ) 1992年

STRUCTURAL-ANALYSIS OF ALF3-CAF2-YF3 GLASS BY DIFFRACTION METHODS

AKASAKA, Y, NANBA, T, INOUE, H, OSUKA, T, YASUI, I

Journal of Non-Crystalline Solids 140 ( 1-3 ) 1992年

REFLECTIVITY AND ELECTRONIC-STRUCTURES OF LAYERED IONIC-CRYSTALS (CNH2N+1NH3)2CUCL4 - N = 1,2,3

YOSHINARI, T, NANBA, T, SHIMANUKI, S, FUJISAWA, M, AOYAGI, K

Journal of the Physical Society of Japan 61 ( 7 ) 1992年

The influence of internal stress on the amorphous structure of wet-coated films derived from peroxopolytantalate solution

A. Kishimoto, H. Sugimoto, T. Nanba, T. Kudo

Thin Solid Films 204 ( 1 ) L5 - L8 1991年9月

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

Tokuro Nanba, Sanae Takano, Itaru Yasui, Tetsuichi Kudo

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

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

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 査読

T. Nanba, Y. Nishiyama, I. Yasui

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

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

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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BA ADDITION TO THE HIGH-TC PHASE IN THE BI-PB-SR-CA-CU-O SYSTEM

TAKADA, J, FUJIWARA, M, NANBA, T, EGI, T, IKEDA, Y, HIROI, Z, TAKANO, M, MAZAKI, H

Physica C 190 ( 1-2 ) 1991年

X-RAY-DIFFRACTION STUDY OF THE STRUCTURE OF SILICON-NITRIDE FIBER MADE FROM PERHYDROPOLYSILAZANE

YOKOYAMA, Y, NANBA, T, YASUI, I, KAYA, H, MAESHIMA, T, ISODA, T

Journal of the American Ceramic Society 74 ( 3 ) 1991年

STRUCTURE OF AMORPHOUS TA2O5.NH2O DERIVED FROM PEROXO-POLYTANTALATE SOLUTION

KISHIMOTO, A, SUGIMOTO, H, NANBA, T, KUDO, T

Journal of Solid State Chemistry 90 ( 1 ) 1991年

SPIN-COATED TA2O5.NH2O FILMS DERIVED FROM PEROXO POLY-TANTALATE SOLUTION

KISHIMOTO, A, NANBA, T, KUDO, T

Solid State Ionics 40-1 903 - 905 1990年8月

Application of Thin Film Diffractometer to Structural Study of Amorphous Thin Films 査読

Tokuro Nanba, Itaru Yasui

Analytical Sciences 5 ( 3 ) 257 - 262 1989年2月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

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 査読

Tokuro Nanba, Itaru Yasui

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

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

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.

DOI： 10.1016/0022-4596(89)90180-1

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Diffraction Studies of AlF₃-BaF₂-CaF₂ Glasses 査読

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

Materials Science Forum 32-33 385 - 390 1988年9月

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