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

Decomposition behavior of high-Tc superconductor YBa₂Cu₃O_x in water

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

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JOURNAL OPEN ACCESS

1987 Volume 34 Issue 10 Pages 651-658

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

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Published: December 25, 1987 Received: December 07, 1987 Available on J-STAGE: May 22, 2009 Accepted: - Advance online publication: - Revised: -
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Date of correction: May 22, 2009 Reason for correction: - Correction: ABSTRACT Details: 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.

Date of correction: May 22, 2009 Reason for correction: - Correction: PDF FILE Details: -

Abstract

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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