Standard enthalpies of formation of some 3d transition metal gallides by high temperature direct synthesis calorimetry

Abstract

The standard enthalpies of formation of some 3d transition metal gallides have been measured by high temperature direct synthesis calorimetry at 1373±2 K. The following results in kJ/mol of atoms are reported: Sc5Ga3 (−59.4±2.0); Ti2Ga (−39.0±1.4); V2Ga5 (−16.6±1.7); Cr3Ga (−11.8±1.8); FeGa3 (−24.8±2.1); CoGa3 (−29.4±2.2) and NiGa (−44.9±1.9). The results are compared with some earlier values obtained by solution calorimetry or derived from EMF measurements. They are also compared with predicted values from the semi-empirical model of de Boer et al. and with available enthalpies of formation for 3d transition metal aluminides and germanides.