Phase Relations in the Bi–Sr–Ca–Cu–M–O (M = Y, Dy, Ho, Er, Tm, Yb, Lu) Systems

被引：0
|
作者：
P. E. Kazin
D. D. Zaitsev
Yu. D. Tret'yakov
M. Jansen
机构：
[1] Moscow State University,
[2] Max-Planck-Institut für Festkörperforschung,undefined
来源：
Inorganic Materials | 2001年 / 37卷
关键词：
Inorganic Chemistry; Rare Earth; Phase Relation; Nominal Composition; Major Fraction;
D O I：
暂无
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学科分类号：
摘要：
The phase relations in the Bi–Sr–Ca–Cu–M–O (M = Y, Dy, Ho, Er, Tm, Yb, Lu) systems near Bi2Sr2CaCu2O8+ x(Bi-2212) were studied between 850 and 990°C. The results demonstrate that larger sized rare earths (Y, Dy, Ho, Er) substitute on the Ca site in Bi-2212, leading to the formation of CaO. Smaller sized rare earths (Tm, Yb, Lu) replace lesser amounts of Ca and form Sr2MBiO6phases. In the material of nominal composition Bi2Sr2Ca0.85M0.15Cu2O8 + x+ 0.25Sr2YBiO6prepared via melt processing, a major fraction of the Y atoms substitute for Ca in Bi-2212, resulting in a low-Tcmultiphase superconductor. In the analogous Yb system, a Bi-2212–Sr2YbBiO6composite with Tc= 87 K is obtained.
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页码：812 / 816
页数：4
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