Improvement on Lennard-Jones-Devonshire theory for predicting liquid-solidphase transition

In this paper the potential energy of the Lennard-Jones and Devonshire (LJD ) model has been corrected to increase its PVT prediction abilities. The co rrection of potential energy is done in two ways (i) taking the coordinatio n number as a function of temperature and volume to improve the second viri al prediction ability and (ii) taking pair correlation effects into account to improve the phase transition prediction ability. The results of calcula tions indicate improvement both on PVT behavior in the above range of varia tion especially on the phase transition prediction ability in solid-liquid and vapor-liquid regions. (C) 1999 American Institute of Physics. [S0021-96 06(99)50344-9].