Thermodynamic properties of gold telluride

Abstract

The heat capacity of gold telluride, AuTe₂, has been measured at 11–320 K by adiabatic calorimetry and the heat content at 367–678 K by ‘drop’ calorimetry to give S°_298·15(s)=(141·7 ± 0·4) J K^–1 mol^–1 and for 298–737 K, C_p(s)=(63·61 + 0·03743T+ 172300/T²) J K^–1 mol^–1. The dissociation pressures of AuTe₂ at 629–715 K have been measured by the Knudsen effusion method, and with the other data, used to calculate the heat and Gibbs energy of formation of AuTe₂. ΔH°_f298=(–18·6 ± 3) kJ mol^–1; ΔG°_f298=–17·3 kJ mol^–1.