Study of the negative thermal expansion of cuprite-type structures by means of temperature-dependent pair distribution function analysis: Preliminary results

被引：12

作者：

Dapiaggi, Monica ^{[1
]}

Kim, HyunJeong ^{[2
]}

Bozin, Emil S. ^{[2
]}

Billinge, Simon J. L. ^{[2
]}

Artioli, Gilberto ^{[3
]}

机构：

[1] Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Univ Padua, Dipartimento Geosci, I-35137 Padua, Italy

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 09期

基金：

美国国家科学基金会;

关键词：

oxides; Neutron scattering; Thermal expansion;

D O I：

10.1016/j.jpcs.2008.03.030

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Copper (I) and silver (I) oxides crystallize with the same structure, and both show a wide range of negative thermal expansion (NTE): Cu2O contracts with temperature up to about 200 K and then expands, while Ag2O has a NTE up to its decomposition temperature at about 450 K. Here we report a careful temperature-dependent pair distribution function (PDF) analysis that showed that copper oxide, at about 200 K, exhibits geometric distortions of the tetrahedral units, probably related to a change in the solid angle of the polyhedra. Silver oxide, on the other hand, showed the same distortions even at the lowest temperature measured (10 K): structural refinements of the PDF confirmed the presence of local distortions (below 10 angstrom) at all temperatures. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2182 / 2186

页数：5

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