Enhanced negative thermal expansion in Lu2W3O12

被引：152

作者：

Forster, PM

Yokochi, A

Sleight, AW

机构：

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

[2] Oregon State Univ, Ctr Adv Mat Res, Corvallis, OR 97331 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1998年 / 140卷 / 01期

关键词：

D O I：

10.1006/jssc.1998.7967

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Negative thermal expansion in the Sc2W3O12 family has been pushed to much more pronounced values by substituting a large cation for Sc. X-ray diffraction measurements from 127 to 627 degrees C give a linear thermal expansion coefficient of -6.8x10(-6)/degrees C for Lu2W3O12 compared to -2.2 x 10(-6)/degrees C for Sc2W3O12. Negative thermal expansion in this family is dependent on the rocking motions of polyhedra. However, polyhedra in this structure cannot rock without changing their shape. Larger cations expand the octahedra, reducing the oxygen-oxygen repulsions within the polyhedra. This facilitates the polyhedra shape changes necessary for the rocking motions required for negative thermal expansion. (C) 1998 Academic Press.

引用

页码：157 / 158

页数：2

共 4 条

[1] Negative thermal expansion in a large molybdate and tungstate family [J].