UDC 662.21

Aditya M. Vora

STUDY OF THERMODYNAMIC PROPERTIES OF LIQUID BINARY ALLOYS
BY A PSEUDOPOTENTIAL METHOD

On the basis of the Percus-Yevick hard sphere model 
as a reference system and the Gibbs-Bogoliubov inequality, a thermodynamic 
perturbation method is applied with the use of the well-known model 
potential. By applying a variational method, the hard core diameters 
are found which correspond to a minimum free energy. With this procedure, 
the thermodynamic properties such as the internal energy, entropy, 
Helmholtz free energy, entropy of mixing, and heat of mixing are computed 
for liquid NaK binary systems. The influence of the local field correction 
functions of Hartree, Taylor, Ichimaru-Utsumi, Farid-Heine-Engel-Robertson, 
and Sarkar-Sen-Haldar-Roy is also investigated. The computed 
excess entropy is in agreement with available experimental data in 
the case of liquid alloys, whereas the agreement for the heat of mixing 
is poor. This may be due to the sensitivity of the latter to the potential 
parameters and dielectric function.

Keywords: pseudopotential method, liquid NaK alloys, Percus-Yevick 
(PY) hard sphere model, local field correction functions, thermodynamic 
properties.

Humanities and Social Science Department, STBS College 
of Diploma Engineering, Opp. Spinning Mill, Varachha Road, Surat 395006, 
South Gujarat, India; email: voraam@yahoo.com. Original article submitted 
November 18, 2008; revision submitted October 30, 2009.