Abstract
The activities and free energies of formation of solid Ni-Pt alloys at 1625°K were calculated from vapor-pressure measurements obtained with a torsion-effusion apparatus. Heats of formation at 298°K were determined by liquid-tin solution calorimetry. The entropies of formation at 1625°K were computed from the experimental free energy and heat-of-formation values, assuming Neumann-Kopp behavior between 298 and 1625°K. The heat-of-formation results appear to reflect the ordered structures that exist at low-temperatures in the Ni-Pt system. The entropies are believed to be largely configurational in origin.
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