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Abstract
The standard enthalpies of formation of the Intermetallic compounds RuTi, RuZr, and RuHf have been determined by high temperature mixing calorimetry at 1400 K. The following values of ΔHf are reported: RuTi: -153.9 ± 7.4 kJ mol−1; RuZr: -137.3 ± 6.8 kJ mol−1; RuHf: -183.5 ±10.4 kJ mol−1. Since there are no experimental data for these compounds in the literature, comparisons are made with predicted and estimated values. The new data also are compared with recent results reported by the authors for the corresponding equiatomic alloys of Pd and Rh with Ti, Zr, and Hf. This comparison indicates that RuTi is significantly more exothermic than inferred from the systematic trend(s) shown by the other compounds studied.
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