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Mechanisms of structural anomaly and orthorhombic–tetragonal transition of YBa2Cu3Oy

Published online by Cambridge University Press:  31 January 2011

Ma-Shine Wu  and
Tsang-Tse Fang
Ma-Shine Wu
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
Tsang-Tse Fang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
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Abstract

Powdered samples of oxygen-deficient YBa2Cu3Oy were annealed in various atmospheres at 880 and 300 °C to study the relations of structural anomaly, phase transition, and oxygen content. It was found that the structural anomaly in the c axis is reversible during oxygenation and deoxygenation. The change of the c axis arose from the electrical repulsion among Ba and Cu cations as oxygen was removed or refilled. The anomaly in the c axis occurred when the oxygen was further removed or refilled to a critical value, at which structural relaxation and electrical repulsion changed greatly. The phase transition is attributed to the anomalous change in the c axis, and the mechanism is proposed and discussed in this paper.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3506 - 3510
Copyright
Copyright © Materials Research Society 1999

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