The Physical and Thermodynamic Functions of Borides

N.Yu. Filonenko

doi:10.15330/pcss.18.1.58-63

Authors

N.Yu. Filonenko State Establishment “Dnipropetrovsk Medical Academy of Health Ministry of Ukraine”

DOI:

https://doi.org/10.15330/pcss.18.1.58-63

Keywords:

borides, Gibbs energy, entropy, enthalpy, heat capacity, fluctuation process

Abstract

In the paper the physical properties and thermodynamic functions of borides Х₂В (Х=W, Mo, Mn, Fe, Co, Ni та Cr) are studied with accounting for fluctuation processes. We use the microstructure analysis, the X-ray structural and the durometric analyses to determine the physical properties of alloys. In the paper it is determined the phase composition and physical properties of borides. In this paper for the first time it is determined the thermodynamic functions of borides using the Hillert and Staffansson model with accounting for the first degree approximation of high-temperature expansion for the free energy potential of binary alloys. We obtain the temperature dependences for such thermodynamic functions as Gibbs free energy, entropy, enthalpy and heat capacity С_р along with their values at the formation temperature for Х₂В (Х=W, Mo, Mn, Fe, Co, Ni та Cr). The approach under consideration enables to give more thorough from the thermodynamic point of view description of borides formed from the liquid. The outcomes of the thermodynamic function calculation for borides are in good agreement with experimental data and results of other authors.

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