THE EXCESS-ENTHALPIES OF LIQUID CU-GE-TE ALLOYS

The excess enthalpies of liquid alloys in the ternary system Cu-Ge-Te were determined at 1173 K in a heatflow calorimeter. The largest value s of the exothermic enthalpies are found on a line stretching from the compositions Cu2-epsilonTe to GeTe. The results were compared with va lues calculated from the enthalpy data of the limiting binaries. The e xperimental data deviate from the calculated values. The difference is explained assuming ion-ion and ion-atom interactions which are caused in melts of the binary chalcogen systems by the addition of a third c omponent.