GRAIN-GROWTH AND THE MICROSTRUCTURAL EFFECTS ON THE PROPERTIES OF YBA2CU3O7-Y SUPERCONDUCTOR

被引：23

作者：

CHU, CT

DUNN, B

机构：

[1] Department of Materials Science and Engineering, Solid State Science Center, University of California-Los Angeles, Los Angeles

来源：

JOURNAL OF MATERIALS RESEARCH | 1990年 / 5卷 / 09期

关键词：

D O I：

10.1557/JMR.1990.1819

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructural development and grain growth of YBa2Cu3O7−y ceramics at 925, 950, and 975 °C were studied. Densification occurred quite rapidly at temperatures below 925 °C. The grain growth of YBa2Cu3O7−y followed a [formula omitted] relation when sintered at 925 and 950 °C. At 975 °C, the kinetics changed to cubic (D) behavior, which can be attributed to the formation of a liquid phase at grain boundaries. A trend of decreasing Jc with increasing sintering temperature was observed. Other properties including Tc and the width of the transition were virtually unaffected by the change in microstructure. Without prolonged annealing, a relatively homogeneous oxygen stoichiometry of 6.8 was obtained for fairly dense samples (>93% of theoretical). These results suggest that the oxygenation rate of YBa2Cu3O7−y was quite rapid between the tetragonal phase and the orthorhombic composition of YBa2Cu3O6.8. © 1990, Materials Research Society. All rights reserved.

引用

页码：1819 / 1826

页数：8

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