Thermodynamic Properties and Equations of State for Solid and Liquid Magnesium

Abstract

High-temperature equations of state (EoSs) for solid magnesium with hexagonal close-packing (hcp) and for liquid magnesium were formulated herein by using experimental data on the thermodynamic properties, thermal expansion, compressibility, temperature-dependent bulk compression modulus, and melting curve. The totality of experimental data was co-optimized using the temperature-dependent Tait EoS over a pressure range of 0–500 kbar at temperatures of 20–923 K for solid Mg and at 923–2000 K for liquid Mg. The temperature dependence of thermodynamic and thermophysical parameters was described by the extended Einstein model. The resultant EoSs give a good fit to the whole set of experimental data within measurement errors of individual quantities. The high prediction accuracy was achieved by estimating the thermodynamic and thermophysical properties of solid Mg. For liquid Mg, the suggested model adequately describes and, in some cases, averages the existing experimental data.