Mechanisms of structural anomaly and orthorhombic-tetragonal transition of YBa_2Cu_3O_y,

Ma-Shine Wu; Tsang-Tse Fang

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Mechanisms of structural anomaly and orthorhombic-tetragonal transition of YBa_2Cu_3O_y,

机译：YBa_2Cu_3O_y的结构异常和斜方四边形转变的机理，

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Powdered samples of oxygen-deficient YBa_2Cu_3O, were annealed in various atmospheres at 880 and 300 deg 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.

机译：将缺氧的YBa_2Cu_3O的粉末样品在880和300℃的各种气氛中进行退火，以研究结构异常，相变和氧含量的关系。发现在氧合和脱氧过程中c轴的结构异常是可逆的。除去或重新填充氧气后，Ba和Cu阳离子之间的电排斥引起c轴的变化。当进一步除去氧气或将氧气重新填充到临界值时，会发生c轴异常，此时结构弛豫和电斥力发生了很大变化。相变归因于c轴的异常变化，本文提出并讨论了这种机理。

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来源
《Journal of Materials Research》 |1999年第9期|3506-3510|共5页
作者
Ma-Shine Wu; Tsang-Tse Fang;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
中图分类工程材料学;
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Mechanisms of structural anomaly and orthorhombic-tetragonal transition of YBa_2Cu_3O_y,

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