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Ab initio calculations of structure and thermodynamic properties of tetragonal-TiH2 under high temperatures and pressures

Published online by Cambridge University Press:  03 October 2013

X.K. Liu ,
B. Tang  and
Y. Zhang
X.K. Liu*
Affiliation:
Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, P.R. China
B. Tang
Affiliation:
Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, P.R. China
Y. Zhang
Affiliation:
Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, P.R. China
*
ae-mail: [email protected]
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Abstract

The structural and thermodynamic properties of tetragonal-TiH2 under high temperatures and pressures are investigated by Ab initio calculations based on pseudo-potential plane-wave density functional theory method within using the generalized gradient approximation (GGA) and quasi-harmonic Debye model. Some ground state properties such as lattice constants, bulk modulus and elastic constants are good agreement with the available experimental results and other theoretical data. Through the quasiharmonic Debye model, in which the phononic effects are considered, the thermodynamic properties of tetragonal-TiH2 such as thermal expansion coefficient, Debye temperature, heat capacity and Grüneisen parameters dependence of temperature and pressure in the range of 0–1000 K and 0–10 GPa are also presented, respectively.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 64 , Issue 1 , October 2013 , 10201
Copyright
© EDP Sciences, 2013

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