Elasticity of hexagonal-closed-packed cobalt at high pressure and temperature: A quasiharmonic case

被引：30

作者：

Antonangeli, Daniele ^{[1
]}

Krisch, Michael ^{[2
]}

Farber, Daniel L. ^{[1
]}

Ruddle, David G. ^{[1
]}

Fiquet, Guillaume ^{[3
,4
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] Univ Paris 06, Inst Minerol & Phys Milieux Condenses, UMR CNRS 7590, Inst Phys Globe Paris, F-75005 Paris, France

[4] Univ Paris 07, F-75005 Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.100.085501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed high-resolution inelastic x-ray scattering measurements on a single crystal of hcp cobalt at simultaneous high pressure and high temperature, obtaining 4 of the 5 independent elements of the elastic tensor. Our experiments indicate that the elasticity of hcp-Co is well described within the quasiharmonic approximation and that anharmonic high-temperature effects on the elastic moduli, sound velocities, and elastic anisotropy are minimal at constant density. These results support the validity of Birch's law and represent an important benchmark for ab initio thermal lattice dynamics and molecular-dynamics simulations.

引用

页数：4

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