Unusual thermal conductivity of the negative thermal expansion material, ZrW2O8

被引：69

作者：

Kennedy, CA

White, MA ^{[1
]}

机构：

[1] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4J3, Canada

[2] Dalhousie Univ, Inst Mat Res, Halifax, NS B3H 4J3, Canada

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 134卷 / 04期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

heat conduction; heat capacity; phonons;

D O I：

10.1016/j.ssc.2005.01.031

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In order to investigate the relationship between negative thermal expansion and other thermal properties, the thermal conductivity of the alpha-phase of ZrW2O8 has been determined front 1.9 to 390 K. In addition, the heat capacity was measured from 1.9 to 300 K. The thermal conductivity of ZrW2O8 is low, glass-like and close to its theoretical minimum value. The phonon-phonon coupling of the highly anharmonic low-frequency modes which are responsible for negative thermal expansion in ZrW2O8 appears to be highly efficient, leading to short phonon mean free paths and exceptionally low thermal conductivity. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：271 / 276

页数：6

共 45 条

[1] Improvement of the laser flash method to reduce uncertainty in thermal diffusivity measurements [J].