Structure and properties of Tl2Nb2O6+x phases with the pyrochlore structure

被引：10

作者：

Uma, S

Kodialam, S

Yokochi, A

Khosrovani, N

Subramanian, MA

Sleight, AW

机构：

[1] Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA

[2] Dupont Co, Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2000年 / 155卷 / 01期

基金：

美国国家科学基金会;

关键词：

thallium niobate; structure; composition;

D O I：

10.1006/jssc.2000.8937

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Phases with the cubic pyrochlore structure and the composition Tl2Nb2O6+x were prepared under various oxygen pressures. Rietveld refinements of neutron powder diffraction data showed 10.674 Angstrom for x = 0.11, a = 10.637 Angstrom for x = 0,44, and a = 10.627 Angstrom for x = 0.64. Reflections forbidden by spherical atoms in ideal positions are observed at x = 0.11, and these can be attributed to an anisotropic thermal displacement parameter for Tl. Despite the Tl(I)/Tl(III) mixed valency, these phases show a high electrical resistivity. (C) 2000 Academic Press.

引用

页码：225 / 228

页数：4

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