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Abstract
The standard enthalpies of formation of the intermetallic compounds PtTi, PtZr, and PtHf have been determined by high temperature mixing calorimetry in a new calorimeter operated at (1473 ± 2) K. The following values of Δ° are reported. PtTi:-159.3 ± 12.9 kJ mol-1; PtZr: -191.9 ± 12.4 kJ mol-1; PtHf: -227.3 ± 13.2 kJ mol-1. These results are compared with recent experimental values obtained by high temperature direct combination calorimetry, with predicted values and with our own recently published data for the equiatomic alloys of Ti, Zr, and Hf with Pd, Rh, and Ru. The enthalpies of formation of the Pt compounds are significantly more exothermic than the corresponding Pd, Rh, and Ru compounds.
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