Equation of state for solids under high pressure,with application to alkali halides

A new equation of state has been derived from an analysis of the relations between energy, pressure and volume combined with a Padé approximation for the pressure. This modified equation of state is first tested by comparison with the exact expressions that are obtained for four-potential models, the Lennard-Jones, the Morse, the Born-Mayer, and the Varshni-Shukla potentials, with excellent results. It is also compared with experimental high-pressure data for four alkali halide crystals with quite good results.