ENHANCED CRITICAL-CURRENT IN TL-BA-CA-CU-O SUPERCONDUCTORS PREPARED BY DIFFUSION PROCESS WITH FLUORINE ADDITION

被引：16

作者：

KIKUCHI, A ^{[1
]}

KINOSHITA, T ^{[1
]}

NISHIKAWA, N ^{[1
]}

KOMIYA, S ^{[1
]}

TACHIKAWA, K ^{[1
]}

机构：

[1] CRIEPI,KOMAE RES LAB,KOMAE,TOKYO 201,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1995年 / 34卷 / 2A期

关键词：

TL-BA-CA-CU-O; CRITICAL CURRENT; DIFFUSION PROCESS; F ADDITION; PHASE TRANSFORMATION; O-2; ANNEALING;

D O I：

10.1143/JJAP.34.L167

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In the Tl-Ba-Ca-Cu-O (TBCCO) diffusion composites, critical current (I-c) at 77 K is significantly improved by fluorine (F) addition to the coating layer. The F addition decreases the degradation of I-c under magnetic field at 77 K, and shifts the irreversibility lines to higher temperatures. The X-ray diffraction study reveals that F addition promotes the phase transformation from 2223 to 1223. Meanwhile, annealing in flowing O-2 at 550 degrees C-600 degrees C also increases I-c at 77 K. O-2 annealing seems to improve the weak links between superconducting grains. The largest transport critical current density (J(c)) of the specimen with F addition and O-2 annealing exceeds 10000 A/cm(2) at 77 K. In the present TBCCO diffusion composites with F addition, the effect of phase transformation on I-c performance has been clearly observed.

引用

页码：L167 / L170

页数：4

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