CHARACTERIZATION OF INCOMMENSURATE BI2+XSR2-XCUOZ BY X-RAY-POWDER DIFFRACTION AND OXYGEN-CONTENT DETERMINATIONS

被引：26
|
作者：
SINCLAIR, DC
IRVINE, JTS
WEST, AR
机构：
[1] Department of Chemistry, University of Aberdeen, Great Britain
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1990年 / 29卷 / 11期
关键词：
Bismuth strontium cuprate; Cuprate superconductor; Incommensurate structure;
D O I：
10.1143/JJAP.29.L2002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The composition-temperature stability region of the solid solution Bi2+xSr2-xCuOz, phase R, has been determined. At 800°C, and at melting temperatures, with a supercell vector q*given by q*=n δb*-nεc*, where δ=0.21, ε=0.55, for x=0.30 and n=1, 2 …. Both a and ε increased with x, c decreased with x and δ was independent of x. The excess oxygen content, α, was determined to be (0.18±0.02) by citrate iodometry and was independent of x. The total oxygen content z, given by z=6+x/2+α, was confirmed to be 6.33±0.04, for x=0.30, by hydrogen reduction thermogravimetry. © 1990 IOP Publishing Ltd.
引用
收藏
页码：L2002 / L2005
页数：4
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