AG-SHEATHED TAPES PRODUCED WITH PREREACTED BI2223 POWDER - CRITICAL CURRENTS AND IMPURITY PHASE DEVELOPMENT

被引：6

作者：

DAUMLING, M ^{[1
]}

JEREMIE, A ^{[1
]}

FLUKIGER, R ^{[1
]}

机构：

[1] UNIV GENEVA,DEPT MATIERE CONDENSEE,CH-1211 GENEVA 4,SWITZERLAND

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1993年 / 6卷 / 10期

关键词：

Impurity phase development - Silver sheath - Transport critical current densities;

D O I：

10.1088/0953-2048/6/10/003

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have performed investigations of phase coexistence and critical current density on tapes of (Bi, Pb)2Sr2Ca2Cu3Ox (2223) with a silver sheath, produced by the powder-in-tube method. The powder used was prereacted 2223 phase (with mainly 2212 impurities). It was found that the 2201 phase is formed (and the 2212 phase disappears) at 840-degrees-C in an Ag sheath, indicating that a different phase equilibrium may exist with and without the Ag sheath. Post-annealing at T < 830-degrees-C leads to a reappearance of the 2212 phase while the 2201 phase disappears. Transport critical current densities (77 K, self-field) are zero for tapes quenched from 840-degrees-C. For tapes post-annealed at lower temperatures it appears as if all of the current is carried in links of 2212 (and not 2223) created between 2223 grains.

引用

页码：721 / 724

页数：4