Thermodynamic properties of magnetic liquid metals in undercooled region

The experimental study of the thermodynamic properties of liquid Metals has been confined usually to the stable liquid range of temperature and pressure. Nevertheless, there is a significant range between the melting point and the glass transition over which the liquid state can exist in a metastable equilibrium provided that crystallization can be avoided. The specific heat of undercooled liquid metals is a very important thermodynamic parameter. Appropriate knowledge of Delta C(p)(1-x) i.e. the difference of specific heats of undercooled liquid and the corresponding crystalline solid can be utilized to derive accurate results for the parameters like Delta G, Delta S and Delta H. However, the experimental determination of C(p) in undercooled system is difficult due to its metastable nature. Still, it is possible to arrive at an expression for the Delta C(p)(1-x), if the value of Delta C(p)(m) i.e. specific heat difference at melting point and the nature of variation of Delta C(p)(1-x) in undercooled region can be estimated. In the present paper, Delta G for pure liquid Co and Ni have been estimated using linear temperature dependence of Delta C(p) in the undercooled region. Further, a general expression has been used which is valid in a large temperature range. The calculated results for Delta G are in excellent agreement with experimental data. Other thermodynamic parameters like AS and Delta H are also evaluated.