ENHANCEMENT OF TC IN (BI,PB)-2223 SUPERCONDUCTOR BY VACUUM ENCAPSULATION AND POSTANNEALING

被引：26

作者：

WANG, J

WAKATA, M

KANEKO, T

TAKANO, S

YAMAUCHI, H

机构：

[1] Superconductivity Research Laboratory, International Superconductivity Technology Center, Koto-Ku, Tokyo, 135

来源：

PHYSICA C | 1993年 / 208卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)90203-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

(Bi,Pb)-2223 superconductors with nominal composition Bi1.85Pb0.35Sr2Ca2Cu3.1Oy were synthesized as almost single phase samples, with a T(c onset) of 110 K. By applying a vacuum encapsulation and low temperature post-annealing process, T(c onset) increased to 115 K, and T(c zero) exceeded 110 K. If samples were encapsulated in an oxygen atmosphere, T(c) did not enhance after post-annealing. The powder X-ray diffraction analysis showed that, with the enhancement of T(c), the lattice parameters a and c increased. From thermoelectric power measurements and the evolution of the lattice constants, it is suggested that the increases in T(c) may be due to the decreases in hole concentration.

引用

页码：323 / 327

页数：5

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