THERMODYNAMIC PROPERTIES OF SILICIDES .5. FLUORINE-COMBUSTION CALORIMETRIC DETERMINATION OF THE STANDARD MOLAR ENTHALPY OF FORMATION AT THE TEMPERATURE 298.15 K OF TRIMOLYBDENUM MONOSILICIDE MO3SI, AND A CRITICAL ASSESSMENT OF ITS THERMODYNAMIC PROPE

摘要

The massic (formerly called specific) energies of combustion in fluorine of two different specimens of trimolybdenum monosilicide have been measured in a bomb calorimeter and the standard molar enthalpy of formation Delta(f)H(m)(o)(Mo3Si,cr,298.15 K) determined to be -(125.2 +/- 5.8) kJ . mol(-1). A critical evaluation of the thermodynamic properties of Mo3Si is also presented, and recommended values for the standard molar enthalpy increments, standard molar heat capacities, standard molar enthalpies of formation, and standard molar Gibbs free energies of formation have been tabulated to T = 2300 K. (C) 1996 Academic Press Limited [References: 44]