Standard molar enthalpy of formation of FeGe(s) and FeGe2(s) intermetallic compounds

Abstract Thermodynamics plays an important role in predicting long term stability of the materials under different reactive conditions. The present paper describes determination of standard molar enthalpies of formation of FeGe(s) and FeGe 2 (s) compounds employing a high temperature solution calorimeter. The reaction enthalpies of Fe(s), Ge(s), FeGe(s) and FeGe 2 (s) in liquid Sn at 986 K were measured using a Calvet calorimeter. The standard molar enthalpy of formation of the compounds at 298 K (Δ f H 298 ° ) were calculated using the measured reaction enthalpy data. The values of Δ f H 298 ° of FeGe(s) and FeGe 2 (s) at 298 K were found to −15.56 ± 0.92 and −36.89 ± 1.17 kJ mol − 1 , respectively. The standard molar enthalpy of formation of FeGe(s) and FeGe 2 (s) at 298 K obtained experimentally has been compared with the calculated values derived using Vienna ab initio simulation package (VASP).