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The Stacey reciprocal K-primed equation of state (EOS) and the Kushwah EOS have been used in the present study to determine values of pressure, bulk modulus and its pressure derivative for some bcc transition metals viz. W, Ta and Mo down to a compression, V/V0 = 0.7. The results thus obtained are then used to evaluate volume dependence of the Grüneisen parameter using the free-volume theory. Melting of the transition metals has been studied on the basis of the Lindemann-Gilvarry law. It is concluded that the root mean square amplitude of atomic vibrations does not remain a definite fraction of the interatomic distance at melting under changing pressure. [ABSTRACT FROM AUTHOR]

We have used high pressure equations of state (EOS) to determine the thermoelastic properties particularly the Grüneisen parameter and its higher order volume derivatives based on the generalized free-volume theory. The calculations have been performed using the Stacey reciprocal K-primed EOS and the Kushwah generalized logarithmic EOS to find the pressure-volume relationships, bulk modulus and its pressure derivatives up to third order for seven metals viz. Ag, Cu, Au, Pt, Al, Ta and W at different values of compression down to V/V0 = 0.5. The results for various thermoelastic parameters show systematic variations with the increase in pressure, and compare well with the values obtained from the Stacey-Davis formulation. [ABSTRACT FROM AUTHOR]