Comparative Theoretical Study for (Ni) Phonon Frequency Spectrum Under High Pressure Using Different EOSs
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- Nickel, Phonon Frequency Spectrum, EOSs, Grüneisen Approximation
- Yousif M. I.; A. M. Al-Sheikh
- In the present work evaluation of the effects of high pressure on phonon frequency spectrum for nickel has been performed by using different equations of state (EOSs) through evaluating lattice vibrations frequencies shift and variations of mode density under high pressure by using Grüneisen approximation. Results obtained for variation of compressed volume with pressure, in the present work, by using Birch-Murnaghan EOS, Modified Lennard-Jones EOS, Vinet EOS (B-M, mGL-J, Vinet) EOSs reveal more agreement, with experimental data, than with theoretical results given in literature. Variation of Grüneisen parameter (γ) under high pressure has been considered in our calculations. Comparison of Ni phonon frequency spectrum under high pressure with considering and ignoringγ variation has been given too.
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