TAILIEUCHUNG - Thermodynamic properties of binary interstitial alloys with a bcc structure: Dependence on temperature and concentration of interstitial atoms

Thermodynamic quantities such as mean nearest neighbor distance, free energy, isothermal and adiabatic compressibilities, isothermal and adiabatic elastic modulus, thermal expansion coefficient, heat capacities at constant volume and constant pressure, and entropy of binary interstitial alloys with a body-centered cubic (BCC) structure with a very small concentration of interstitial atoms are derived using the statistical moment method. | JOURNAL OF SCIENCE OF HNUE DOI Mathematical and Physical Sci. 2015 Vol. 60 No. 7 pp. 146-155 This paper is available online at http THERMODYNAMIC PROPERTIES OF BINARY INTERSTITIAL ALLOYS WITH A BCC STRUCTURE DEPENDENCE ON TEMPERATURE AND CONCENTRATION OF INTERSTITIAL ATOMS Nguyen Quang Hoc Dinh Quang Vinh Bui Duc Tinh Tran Thi Cam Loan Ngo Lien Phuong Tang Thi Hue and Dinh Thi Thanh Thuy Faculty of Physics Hanoi National University of Education Abstract. Thermodynamic quantities such as mean nearest neighbor distance free energy isothermal and adiabatic compressibilities isothermal and adiabatic elastic modulus thermal expansion coefficient heat capacities at constant volume and constant pressure and entropy of binary interstitial alloys with a body-centered cubic BCC structure with a very small concentration of interstitial atoms are derived using the statistical moment method. The obtained expressions of these quantities depend on temperature and concentration of interstitial atoms. The theoretical results are applied to the interstitial alloy FeSi. In the case where the concentration of interstitial atoms of Si is equal to zero we have the thermodynamic quantities of the main metal and the numerical results for the alloy FeSi give the numerical results for Fe. The calculated results of the thermal expansion coefficient and heat capacity at constant pressure in the interval of temperature from 100 to 700 K for Fe are in good agreement with the experimental data. Keywords Binary interstitial alloy statistical moment method coordination sphere. 1. Introduction Thermodynamic and elastic properties of interstitial alloys are of special interest to many theoretical and experimental researchers for example 1-3 . In 4 5 the equilibrium vacancy concentration in BCC substitution and interstitial alloys is calculated taking into account thermal redistribution of the interstitial component in different types of interstices. The

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