Stabilization of Strontium Analogues of Barium Yttrium Cuprate Perovskites via Chemical Substitution

被引：122

作者：

Sunshine, S. A. ^{[1
]}

Schneemeyer, L. F. ^{[1
]}

Siegrist, T. ^{[1
]}

Douglass, D. C. ^{[1
]}

Waszczak, J., V ^{[1
]}

Cava, R. J. ^{[1
]}

Gyorgy, E. M. ^{[1
]}

Murphy, D. W. ^{[1
]}

机构：

[1] AT&T Bell Labs, 600 Mt Ave, Murray Hill, NJ 07974 USA

来源：

CHEMISTRY OF MATERIALS | 1989年 / 1卷 / 03期

关键词：

D O I：

10.1021/cm00003a011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the synthesis and characterization of Sr2YCu3-xMxOy, M = Al, Pb, Fe, and Co, analogues of the 92 K superconducting perovskite Ba2YCu3O7. While phase-pure Sr2YCu3O7 cannot be prepared, cation substitution for Cu stabilizes this phase. Crystals of these phases were grown from CuO-rich melts containing appropriate melt impurities or from lead oxide based melts. Ceramic samples were prepared for detailed studies of stability ranges, oxygen content, and property/dopant relationships. For Sr2YCu3-xMxO7+delta, samples with M = Al or Co have delta = 0 for all x and delta > 0 when M = Fe and x approximate to 1. Samples were characterized by resistivity and dc magnetic susceptibility measurements. Superconductivity is observed in samples with low levels of metal substitution; however, the volume fraction is small (<2%) and cannot be uniquely attributed to the perovskite phase. A comparison of solid-state Al-27 NMR spectra of Ba- and Sr-based perovskites suggest a different Al environment in these two systems.

引用

页码：331 / 335

页数：5

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