Decomposition behavior of high-Tc superconductor YBa2Cu3Ox in water

Hitoshi Kitaguchi; Jun Takada; Akiyoshi Osaka; Yosinari Miura; Naoichi Yamamoto; Yoshio Oka; Masao Kiyama; Teruyoshi Unesaki; Yoichi Tomii

doi:10.2497/jjspm.34.651

YBa₂Cu₃O_xの水による分解挙動に関する研究

北口仁, 高田潤, 尾坂明義, 三浦嘉也, 山本直一, 岡与志男, 木山雅雄, 畦崎輝義, 冨井洋一

著者情報

ジャーナルオープンアクセス

1987 年 34 巻 10 号 p. 651-658

DOI https://doi.org/10.2497/jjspm.34.651

詳細

発行日: 1987/12/25 受付日: 1987/12/07 J-STAGE公開日: 2009/05/22 受理日: - 早期公開日: - 改訂日: -
訂正情報
訂正日: 2009/05/22 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : High-Tc superconductor YBa₂Cu₃O_x(x ?? 6.8) reacts upon water to decompose. In order to clarify the process of decomposition, the microstructure of the YBC ceramics was studied by means of X-ray diffraction and EPMA after the reaction with water under autoclave and ambient conditions. Under the treatment in the autoclave above 100°C, the YBC ceramics were fully decomposed and Y(OH)₃ or YOOH, Ba²⁺ and CuO were found in the solution. Due to the EPMA study on the samples treated under ambient conditions, three regions were confirmed in the grains: a) the inner core region without any interaction with water, b) the intermediate region of low Ba content surrounding the core, and c) the surface layer containing Y and Cu in the molar ratio Y/Cu=1/3 and very little amount of Ba. On these basis, it is concluded that the decomposition of the YBC ceramics is due to the diffuse-out of Ba cations to water and that the decomposition is not accompanied by the formation of Y²BaCuO⁵ phase.
Right : High-Tc superconductor YBa₂Cu₃O_x(x ≈ 6.8) reacts upon water to decompose. In order to clarify the process of decomposition, the microstructure of the YBC ceramics was studied by means of X-ray diffraction and EPMA after the reaction with water under autoclave and ambient conditions. Under the treatment in the autoclave above 100°C, the YBC ceramics were fully decomposed and Y(OH)₃ or YOOH, Ba²⁺ and CuO were found in the solution. Due to the EPMA study on the samples treated under ambient conditions, three regions were confirmed in the grains: a) the inner core region without any interaction with water, b) the intermediate region of low Ba content surrounding the core, and c) the surface layer containing Y and Cu in the molar ratio Y/Cu=1/3 and very little amount of Ba. On these basis, it is concluded that the decomposition of the YBC ceramics is due to the diffuse-out of Ba cations to water and that the decomposition is not accompanied by the formation of Y²BaCuO⁵ phase.

訂正日: 2009/05/22 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

High-Tc superconductor YBa₂Cu₃O_x(x ≈ 6.8) reacts upon water to decompose. In order to clarify the process of decomposition, the microstructure of the YBC ceramics was studied by means of X-ray diffraction and EPMA after the reaction with water under autoclave and ambient conditions. Under the treatment in the autoclave above 100°C, the YBC ceramics were fully decomposed and Y(OH)₃ or YOOH, Ba²⁺ and CuO were found in the solution. Due to the EPMA study on the samples treated under ambient conditions, three regions were confirmed in the grains: a) the inner core region without any interaction with water, b) the intermediate region of low Ba content surrounding the core, and c) the surface layer containing Y and Cu in the molar ratio Y/Cu=1/3 and very little amount of Ba. On these basis, it is concluded that the decomposition of the YBC ceramics is due to the diffuse-out of Ba cations to water and that the decomposition is not accompanied by the formation of Y²BaCuO⁵ phase.

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