Negative thermal expansion in Y2W3O12

被引：127

作者：

Forster, PM ^{[1
]}

Sleight, AW ^{[1
]}

机构：

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

来源：

INTERNATIONAL JOURNAL OF INORGANIC MATERIALS | 1999年 / 1卷 / 02期

基金：

美国国家科学基金会;

关键词：

oxides; neutron scattering; crystal structure;

D O I：

10.1016/S1466-6049(99)00021-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Neutron diffraction data were collected on polycrystalline Y2W3O12 at seven temperatures from 15 to 1373 K. All three cell edges of orthorhombic Y2W3O12 decrease with increasing temperature, giving an average linear thermal expansion coefficient of -7.0 x 10(-6) K-1. Rietveld refinements of the neutron diffraction data show an apparent decrease in the average W-O distance of 0.05 Angstrom from 15 to 1373 K. This apparent decrease causes the decrease in the cell edges, but it is not an actual decrease of average W-O distances. The apparent shrinkage is instead considered to be caused by the transverse thermal motion of oxygen in the Y-O-W linkages. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：123 / 127

页数：5

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