Spatial variations in composition in high-critical-current-density Bi-2223 tapes

被引：22

作者：

Holesinger, TG

Bingert, JF

Teplitsky, M

Li, Q

Parrella, R

Rupich, MP

Riley, GN

机构：

[1] Los Alamos Natl Lab, Div Sci Mat, Met Grp, MST 6, Los Alamos, NM 87545 USA

[2] Amer Supercond Corp, Westborough, MA 01581 USA

来源：

JOURNAL OF MATERIALS RESEARCH | 2000年 / 15卷 / 02期

关键词：

D O I：

10.1557/JMR.2000.0047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A detailed compositional analysis of high-critical-current-density (J(c)) (55 and 65 kA/cm(2) at 77 K) (Bi,Pb)(2)Sr2Ca2Cu3Oy (Bi-2223) tapes was undertaken by energy dispersive spectroscopy in the transmission electron microscope. Structural features were coupled with characteristic compositions of the Bi-2223 phase. The average of all compositional measurements of the Bi-2223 phase was determined to be Bi1.88Pb0.23Sr1.96Ca1.95Cu2.98Oy. However, spatial variations in the Bi-2223 composition and differing phase equilibria were found throughout the filament structure. In particular, a considerable range of Bi-2223 compositions can be found within a single tape, and the lead content of the Bi-2223 phase is significantly depressed in the vicinity of lead-rich phases. The depletion of lead in the Bi-2223 phase around the 3221 phases may be a current-limiting microstructure in these tapes.

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页码：285 / 295

页数：11

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