Effect of Water Vapor and Low-Temperature Decomposition on the Structure and Electrophysical Properties of Nonstoichiometric Compound Ba2YCu3O7-δ

被引：18

作者：

Bobylev, I. B. ^{[1
]}

Zyuzeva, N. A. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2011年 / 112卷 / 02期

关键词：

high-temperature superconductivity; low-temperature annealing; electrophysical properties; TRANSMISSION ELECTRON-MICROSCOPY; YBA2CU3O7-DELTA; DEGRADATION; CERAMICS;

D O I：

10.1134/S0031918X11020165

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of water vapor and decomposition into phases with different oxygen contents on the structure and electrophysical properties of the nonstoichiometric compound Ba2YCu3O7-delta has been studied. Both these factors were shown to lead to the formation of structural defects that can be pinning centers and improve the current-carrying capacity of materials. At the same time, the reaction with water leads to a deterioration of superconducting properties of grain boundaries. The optimum electrophysical properties of Ba2YCu3O7-delta can be reached by choosing appropriate heat-treatment conditions, namely, the temperature and time of annealing and the water-vapor content in the annealing atmosphere. The phase diagram of the Ba2YCu3O6-Ba2YCu3O7 system below 400 degrees C is refined.

引用

页码：127 / 132

页数：6

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