Resistivity and equations of state of warmed gallium melt in megabar pressure range

The electrical conductivity of gallium melt was measured under step shock compression up to $\approx $100 GPa. The semiempirical equation of state (EOS) are constructed in the shock pressure range 30-300 GPa. The EOS was used for reconstruction of thermodynamic history of the sample in the experiments and for the subsequent definition of volume-temperature dependence of gallium melt resistivity. It was shown the volume-temperature dependence of gallium melt resistivity is proportionally to temperature and inversely to the square of characteristic temperature in the shock pressure range 30-80 GPa and temperatures 1000-2000 K. Thus the warmed high pressure gallium phase melt possesses metal conductivity.