Local thermal expansion in a cuprite structure:: The case of Ag2O -: art. no. 025503

被引：62

作者：

Beccara, SA ^{[1
]}

Dalba, G

Fornasini, P

Grisenti, R

Sanson, A

机构：

[1] Ist Nazl Fis Mat, I-38050 Trento, Italy

[2] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy

[3] CNR, Ist Foton & Nanotecnol, IFN, Sez CeFSA Trento, I-38050 Trento, Italy

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.89.025503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The local thermal behavior of the Ag2O framework structure has been studied by extended x-ray absorption ne structure. The average Ag-O nearest-neighbor distance expands upon heating, while the Ag-Ag next-nearest-neighbor distance contracts. An original implementation of the cumulant analysis shows that the Ag-O expansion is a joint effect of potential anharmonicity and geometrical deformation of the Ag4O basic tetrahedral units. Accordingly, the negative thermal expansion of the lattice parameter in Ag2O cannot be explained uniquely in terms of rigid unit modes.

引用

页码：255031 / 255034

页数：4

共 28 条

[21] Negative thermal expansion from 0.3 to 1050 Kelvin in ZrW2O8 [J].