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Mechanisms of structural anomaly and orthorhombic–tetragonal transition of YBa2Cu3Oy

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 cha...

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Bibliographic Details
Published in:Journal of materials research 1999-09, Vol.14 (9), p.3506-3510
Main Authors: Wu, Ma-Shine, Fang, Tsang-Tse
Format: Article
Language:English
Online Access:Get full text
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.1999.0474