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Volume dependence of Grüneisen parameter for MgO and hcp iron
Sheelendra Kumar and Anuj Vijay
We have determined volume dependence of the Grüneisen parameter for MgO and hcp iron using the formulations due to Stacey and Davis based on the third-order of Grüneisen parameter. Values of higher order of Grüneisen parameters up to fourth order have also been obtained with the help of the Shanker reciprocal gamma relationship satisfying the thermodynamic constraints at extreme compression in the limit of infinite pressure. The results determined from the Stacey-Davis formulation present close agreement with those obtained from the Shanker formulation.
Keywords: Grüneisen parameter, higher-order volume derivatives of gamma, MgO, hcp iron, Equation of state