The standard enthalpies of formation of some intermetallic compounds of transition metals by high temperature direct synthesis calorimetry

The standard enthalpies of formation of some intermetallic compounds of transition metals have been measured by high temperature direct synthesis calorimetry at 1373 ± 2 K. The following results (in kJ/mol of atoms) are reported:ScMn2(−26.1±1.9); Sc4Os11(−22.6±3.0); TiMn2(−8.6±1.6); V2Hf(−16.7±1.7); VIr(−28.1±1.7); Fe2Hf(−12.3±1.1); Fe7Nb6(−6.2±1.8); Co3Nb(−7.4±1.9); Co3Ta(−8.5±2.2); NiY(−32.9±1.7)ScMn2(−26.1±1.9); Sc4Os11(−22.6±3.0); TiMn2(−8.6±1.6); V2Hf(−16.7±1.7); VIr(−28.1±1.7); Fe2Hf(−12.3±1.1); Fe7Nb6(−6.2±1.8); Co3Nb(−7.4±1.9); Co3Ta(−8.5±2.2); NiY(−32.9±1.7)The values are compared with some earlier experimental results obtained by EMF and by calorimetry. They are also compared with the predicted values of Miedema and co-workers. We will present a systematic picture of how the enthalpies of formation may be related to the atomic number of the transition metal.