STUDYING HOW THE THERMOELASTIC PROPERTIES OF HCP- IRON CHANGE WITH COMPRESSION BY EMPLOYING THE EQUATION OF STATE, GRUNEISEN PARAMETER MODEL, AND DEBYE MODEL
Abhay P Srivastava, Brijesh K. Pandey
Department of Physics & Material Science, MMM University of Technology, Gorakhpur (UP), IndiaAbstract: In our research, we studied how the thermoelastic properties of ɛ-Fe change under compression. This included looking at the bulk modulus, pressure derivative of bulk modulus, thermal expansivity, Grüneisen parameter, and Debye temperature. We used different equations to determine the Debye temperature, including the Grüneisen parameter-based and Debye models. Our analysis led us to conclude that the Debye model is better than the modified Grüneisen parameter-based model proposed by Kumari and Dass for predicting the compression-dependent Debye temperature. Additionally, we found that a new parameter is needed to calculate the Grüneisen parameter for hcp-iron, which is used to calculate the Grüneisen parameter and falls below the Stacey criterion. Our study discovered that the Birh-Murnaghan, Srivastava-Pandey, and Shanker equations of state are more accurate for predicting the thermoelastic properties of hcp-iron under higher-order compression.
Keywords: Equation of state, Bulk modulus, Debye Temperature, Thermal Expansivity, Gruneisen Parameter.