Effect of final annealing temperature on critical current density of Ag/Bi-(Pb)-Sr-Ca-Cu-O tapes

被引：4
|
作者：
Liu, HK [1 ]
Bhasale, R [1 ]
Guo, YC [1 ]
Horvat, J [1 ]
Zeimetz, B [1 ]
Dou, SX [1 ]
机构：
[1] Univ Wollongong, Ctr Supercond & Elect Mat, Wollongong, NSW 2522, Australia
来源：
APPLIED SUPERCONDUCTIVITY | 1997年 / 5卷 / 1-6期
基金：
澳大利亚研究理事会;
关键词：
D O I：
10.1016/S0964-1807(98)00022-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A two-stage annealing procedure in the final thermal cycle has been tested for processing Ag/Bi:2223 tapes. The effect of various annealing temperatures in the final stage of heat treatment on phase transition, microstructure and critical current (I-c) was investigated for Ag/Bi:2223 tapes. It was found that annealing at higher temperatures (835-845 degrees C) leads to a relatively purer Bi:2223 phase but a small fraction of Bi:2201 always coexists with Bi:2223. Whereas annealing at lower temperatures (800-825 degrees C) results in conversion of Bi:2201 to Bi:2212 and possibly partial decomposition of Bi:2223. I-c was reduced to half for tapes annealed at 835-845 degrees C due to the presence of' Bi:2201, compared with tapes annealed at low temperatures. Scanning electron microscopy (SEM) studies Show that, although the amount of Bi:2201 is small, it resides along the Bi:2223 colony boundaries, blocking the current flow between colonies. The drastic weak link effect of Bi:2201 is attributable to the combination of the elongated platelike morphology and insulating property. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：171 / 177
页数：7
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