Phase equilibria, crystal chemistry and polymorphism of Zn7Sb2O12 doped with Cr and Ni

被引：10

作者：

Harrington, Richard ^{[1
]}

Miles, Gabrielle C. ^{[1
]}

West, Anthony R. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

MATERIALS RESEARCH BULLETIN | 2008年 / 43卷 / 8-9期

基金：

英国工程与自然科学研究理事会;

关键词：

electronic materials; oxides; neutron scattering; phase equilibria; crystal structure;

D O I：

10.1016/j.materresbull.2008.03.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The binary phase diagram for Cr-doped Zn7Sb2O12 was determined and compared with that for Ni-doped Zn7Sb2O12. The beta -> alpha transition temperature, 1225 degrees C for undoped Zn7Sb2O12, decreases extremely rapidly with increasing Cr content; the solubility limit of Cr in beta-(Zn7SbO12)-O-2 is < 1 % but 37.5% in alpha-Zn7Sb2O12. Bond valence sum calculations for the tetrahedral site, which contains exclusively Zn, show it to be significantly underbonded in undoped alpha-Zn7Sb2O12, but less underbonded with increased Ni2+ and especially Cr3+ content, thus providing an explanation for the stabilisation of alpha-Zn7Sb2O12 to lower temperatures on doping with Ni and especially Cr. Sub-solidus compatibility relations in the ternary system ZnO-Sb2O5-Cr2O3 were determined at 1100 degrees C for compositions containing <= 50% Sb2O5. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1949 / 1956

页数：8

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