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FP‐LAPW calculations of structural and elastic properties of tantalum under high pressure
Author(s) -
Liu ZhongLi,
Li XiaoFeng,
Cai LingCang,
Jing FuQian
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201046125
Subject(s) - debye model , tantalum , equation of state , density functional theory , anisotropy , thermodynamics , plane wave , condensed matter physics , debye , materials science , chemistry , computational chemistry , physics , optics , metallurgy
We have revisited and refined the high‐pressure elastic properties of body‐centered‐cubic Ta using the accurate all‐electron full potential linearized augmented plane wave method (FP‐LAPW) within the framework of density functional theory (DFT). Based on the total energy calculations, we first deduced the accurate static equation of state (EOS) of Ta. Then we derived the elastic constants, C 11 , C 12 , and C 44 under pressure up to 500 GPa using the pressure‐correction method which corrected the previous method theoretically, and the calculated elastic constants agree well with experiment under high pressure. From the accurately determined elastic constants, we also discussed the elastic anisotropy and the sound velocities of Ta at high pressure. The predicted Debye temperature at 0 GPa and 0 K is in good agreement with experiment, and the Debye temperature increases monotonously as pressure increases.