Thermodynamic properties of liquid gallium from picosecond acoustic velocity measurements
Résumé
Due to discrepancies in the literature data the thermodynamic properties of liquid gallium are
still in debate. Accurate measurements of adiabatic sound velocities as a function of pressure
and temperature have been obtained by the combination of laser picosecond acoustics and
surface imaging on sample loaded in diamond anvil cell. From these results the
thermodynamic parameters of gallium have been extracted by a numerical procedure up to
10 GPa and 570 K. It is demonstrated that a Murnaghan equation of state accounts well for the
whole data set since the isothermal bulk modulus BT has been shown to vary linearly with
pressure in the whole temperature range. No evidence for a previously reported liquid–liquid
transition has been found in the whole pressure and temperature range explored