Abstract
Abstract The standard enthalpies of formation of some 4d 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: YGa (−71.4±1.7); YGa 2 (−68.1±2.3); Zr 2 Ga (−53.4±2.1); Nb 5 Ga 3 (−26.5±1.7); Mo 3 Ga (−16.6±2.5); RuGa (−35.4±2.3); RuGa 2 (−41.0±1.6); RhGa 3 (−44.9±1.2); RhGa (−73.2±2.3). 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 Miedema and coworkers. We compare the enthalpies of formation of the 3d and 4d gallides and the heats of formation of the 4d gallides with available values for the 4d transition metal aluminides and germanides.
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