Comments on the paper entitled "Pressure variation of melting temperatures of alkali halides"

The expressions for the pressure dependences of bulk modulus and the Gruneisen parameter used by Arafin and Singh [Int. J. Mod. Phys. B 30, 1750031 (2016)] in the Lindemann law for determining melting curves of 14 alkali halides have been found to yield no results which are consistent with the recent studies on equations of state. It is demonstrated here that Arafin-Singh's expressions are physically not acceptable as they are shown here to give unrealistic values of bulk modulus and Gruneisen parameter for the materials at high pressures.