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IJPAP Vol.46(06) [June 2008] >


Title: Thermodynamic properties of magnetic liquid metals in undercooled region
Authors: Dhurandhar, Heena
Rao, T Lilly Shanker
Lad, Kirit N
Pratap, Arun
Keywords: Liquid metals
Thermodynamic properties
Issue Date: Jun-2008
Publisher: CSIR
Abstract: 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 ΔCp¹⁻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 ΔG, ΔS and ΔH. However, the experimental determination of Cp in undercooled system is difficult due to its metastable nature. Still, it is possible to arrive at an expression for the ΔCp¹⁻x, if the value of ΔCpm i.e. specific heat difference at melting point and the nature of variation of ΔCp¹⁻x in undercooled region can be estimated. In the present paper, ΔG for pure liquid Co and Ni have been estimated using linear temperature dependence of ΔCp in the undercooled region. Further, a general expression has been used which is valid in a large temperature range. The calculated results for ΔG are in excellent agreement with experimental data. Other thermodynamic parameters like ΔS and ΔH are also evaluated.
Page(s): 371-374
ISSN: 0019-5596
Source:IJPAP Vol.46(06) [June 2008]

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