Science Journal of Physics

March 2013, Volume 2013, ISSN:2276-6367

Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.

Research Article


Analysis of Melting of Ionic Solids Based on Thermal Equation of State

Author: Smita Korpal, Divya Haridas

Keshav Mahavidyalaya, University of Delhi, Pitam Pura, Delhi, 110034, India

Accepted 21 February, 2013; Available Online 13 March 2013

doi: 10.7237/sjp/219


In the present paper we have studied the melting of ionic solids (NaCl and MgO) by using thermal equation of state based on the method of lattice potential energy. Results obtained from thermal equation of state are found to be imaginary at higher temperatures which are characteristic of every solid. It was observed that the transition point where thermal equation of state gives imaginary results lies close to the melting point of solids. Melting temperature of both ionic solids are calculated. The value of the product of thermal expansivity and isothermal bulk modulus are calculated and agree well with the experimental values reported for high temperatures. Also a relationship between melting temperature and its pressure dependence is obtained and applied to NaCl and MgO to calculate melting temperature at different compressions which are in close agreement with experimental values of melting temperature

Keyword:Thermal equation of state, thermal expansivity, isothermal bulk modulus, ionic solids.