Abstract
The integral molar enthalpy of formation of the alloys { xPt + (1 − x)Ge} at 1352 and 1275 K and of the alloys { xPd + (1 − x)Ge} at 1270 K were measured by direct reaction calorimetry (drop method) using a Calvet calorimeter, and the molar enthalpies of fusion of PtGe and Pd 2Ge were deduced. The strong negative departures from ideality of the two alloys suggest chemical bonding in the liquid state. However, the nature of the chemical short-range order seems to differ and to be closely related to the stability of the congruently melting compounds.
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