Elasticity of hcp cobalt at high pressure and temperature: a quasi-harmonic case

We performed high-resolution inelastic x-ray scattering measurements on a single crystal of hcp cobalt at simultaneous high pressure and high temperature, deriving 4 of the 5 independent elements of the elastic tensor. Our experiments indicate that the elasticity of hcp-Co is well described within t...

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Bibliographic Details
Published in:Physical review letters 2007-11, Vol.100 (8)
Main Authors: Antonangeli, D, Krisch, M, Farber, D L, Ruddle, D G, Fiquet, G
Format: Article
Language:English
Subjects:
ANISOTROPY
APPROXIMATIONS
BENCHMARKS
COBALT
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELASTICITY
GEOSCIENCES
MATERIALS SCIENCE
MONOCRYSTALS
SCATTERING
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Summary:We performed high-resolution inelastic x-ray scattering measurements on a single crystal of hcp cobalt at simultaneous high pressure and high temperature, deriving 4 of the 5 independent elements of the elastic tensor. Our experiments indicate that the elasticity of hcp-Co is well described within the frame of a quasi-harmonic 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 the Birch's law and represent an important benchmark for ab initio thermal lattice dynamics and molecular-dynamics simulations.
ISSN:0031-9007
1079-7114