RIETVELD ANALYSIS OF TL2BA2CAN-1CUNO4+2N (N=1, 2 AND 3) BY POWDER X-RAY-DIFFRACTION

被引：87

作者：

SHIMAKAWA, Y

KUBO, Y

MANAKO, T

NAKABAYASHI, Y

IGARASHI, H

机构：

[1] NEC, Japan

来源：

PHYSICA C | 1988年 / 156卷 / 01期

关键词：

Crystallography; -; Oxides;

D O I：

10.1016/0921-4534(88)90111-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Crystal structures of the phases in the Tl-Ba-Ca-Cu-O system determined by powder X-ray diffraction were refined using Rietveld analysis. Three samples having the general composition Tl2Ba2Can-1CunO4+2n were synthesized. These were Tl2Ba2Ca2Cu3O10 (n=3, 2233 phase) with a Tc of 116 K, Tl2Ba24CaCu2O8 (n=2, 2212 phase) with a Tc of 85 K, and Tl2Ba2CuO6 (n=1, 2201 phase) which did not exhibit superconductivity. The results of the Rietveld analysis revealed that as n increased the lattice parameter, a, and the interatomic distance Cu-O(2) became shorter, and the Tl-O and Ba-O layers showed a tendency to become flatter. Possible substitution of about 10% of the Ca-sites with Tl ions in the 2212 and 2223 phases was also suggested.

引用

页码：97 / 102

页数：6

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