Abstract
The enthalpies of formation of liquid (Ga + Pd) alloys were determined by direct reaction calorimetry in the temperature range 1322 <T/K < 1761 and the molar fraction range 0 <x Pd < 0.87. The enthalpies are very negative with a minimum Δmix H m = −70.4 ± 3.0 kJ mol-1 atx Pd = 0.6, independent of the temperature. Limiting partial molar enthalpies of palladium and gallium were calculated as Δh m (Ga liquid in ∞liquid Pd) = −265 ± 10 kJ mol−1 and Δh m (Pd liquid in ∞liquid Ga) = -144 ± 5 kJ mol−1. The integral molar enthalpy is given by Δmix H m =x(1-x) (-143.73 -232.47x + 985.77x 2-4457.8.x 3 + 6161.1x 4 + 2577.4x 5), wherex = x Pd. Moreover, values for the enthalpies of formation and fusion of PdGa, Pd2Ga, and the solid solution (withx Pd = 0.8571) have been proposed. These results have been discussed taking into account the equilibrium phase diagram.
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