A comparative study of Burakovsky's and Jacobs's volume dependence Grüneisen parameter for fcc aluminum

We compare two expressions for the volume dependence of the Grüneisen parameter γ for fcc Al presented by Burakovsky and Preston (2004) [3] and Jacobs and Schmid-Fetzer (2010) [4], respectively. It’s found that both calculated results of the melting temperature Tm   are in good agreement with experimental data. But the higher order Grüneisen parameters are different. We obtain the values of the third order Grüneisen parameter λ∞λ∞ and the pressure derivative of bulk modulus K′∞K′∞ at extreme pressure, and the parameter f in the generalized free volume formula for the two models. The results show that the Jacobs’s expression of Grüneisen parameter is more suitable for fcc Al.