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Abstract
The enthalpies of formation of the intermetallic compounds PdZr and PdHf have been determined by high temperature mixing calorimetry at 1400 K. The following results are reported: PdZr: ΔH°f = −122.6 ± 7.0 kJ mol−1; PdHf: ΔH°f = −134.8 ± 7.8 kJ mol−1. Our results are compared with estimated and predicted literature values and with approximate experimental values recently obtained by direct high temperature reaction calorimetry. The enthalpies of formation of the equiatomic alloys of the Ti-group metals with Pd show increasing negative values in the series TiPd < ZrPd < HfPd.
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