Description of the thermodynamic properties of pure gold in the solid and liquid states from 0 K

摘要

Thermodynamic data for pure gold were critically assessed using an extended Einstein model from 0 K for the crystalline FCC_A1 phase and a two state model for the liquid phase. During the assessment, careful critical evaluation of the experimental data on thermodynamic properties of solid (FCC_A1) and liquid phases was carried out. Due to the fact that there is a large scatter in the experimental data for crystalline gold in the temperature range between 200 K and the melting point, we carried out additional ab tattle calculations of the thermodynamic properties. In order to fulfil the need for a precise evaluation of S-298.15(o) we needed to use an additional technique using multiple Einstein functions, which allows the experimental heat capacity and enthalpy data for the solid phase to be approximated accurately from 0 K up to the melting point. It was found during the data analysis that there is a large scatter in experimental data for the enthalpy of fusion and the liquid phase.