Monocrystal elastic constants of the negative-thermal-expansion compound zirconium tungstate (ZrW2O8) -: art. no. 025502

被引：102

作者：

Drymiotis, FR

Ledbetter, H

Betts, JB

Kimura, T

Lashley, JC

Migliori, A

Ramirez, A

Kowach, G

Van Duijn, J

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

[3] Johns Hopkins Univ, Baltimore, MD 21218 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.025502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measured zirconium tungstate's elastic constants C-ij. This compound shows relatively soft, nearly isotropic elastic constants with normal Poisson ratios and no approach to Born instability. ZrW2O8 shows normal ambient-temperature elastic constants C-ij, but remarkable dC(ij)/dT that show dominant low-frequency acoustic-vibration modes. From the bulk modulus, we estimated the total ambient-temperature thermodynamic Gruneisen parameter as gamma=-1.2. The dB/dT slope gives a Gruneisen parameter gamma=-7. The 300-0 K bulk-modulus increase (40%) seems unprecedented and breaks Birch's law of corresponding states.

引用

页码：025502 / 1

页数：4

共 32 条

[1] Ionic solids at elevated temperatures and/or high pressures:: lattice dynamics, molecular dynamics, Monte Carlo and ab initio studies [J].