Restudy of Gruneisen parameter of iron in the pressure range of 90-160 GPa

The Hugoniot equation-of-state (EOS) of porous iron with an average initial density of 6.904g/cm(3) has been measured in the pressure range from 90 to 160 GPa, and a good straight fitting D = 2.997 + 1.603 u has accordingly b een obtained, where D is the shock wave velocity and u the particle velocit y, both in units of km/s. Combining this with the Hugoniot EOS of non-porou s iron, the Gruneisen EOS and the Rankine-Hugoniot energy conservation rela tion, anti taking the possible solid-liquid transition correction, we have calculated the Gruneisen parameter gamma of iron and obtained the result ga mma (0)rho (0) = gamma rho =const, with gamma (0) = 1.945 and rho (o) = 7.8 56 g/cm(3), rho being the density.