Temperature Dependence of the Enthalpy of Formation of Liquid Ge Te Alloys

Enthalpies of formation h1 of Ge Te alloys were measured by direct reaction calorimetry in the temperature range 1030 < T/K < 1150 and at mole fractions 0.25 < xGe < 1. The measurements were performed with a high temperature (T/K < 1400) Tian‐Calvet calorimeter. When referred to liquid tellurium and liquid germanium, the enthalpy of formation is strongly negative in the whole investigated composition range (at T/K = 1028 and xGe = 0.46, hmin1 = – 14.8kJmol−1) and appears to be very sensitive to temperature (CPE = 19.3 J mol−1 K−1 at xGe = 0.5). Such a behaviour is consistent with the existence of Ge  Te associations in the liquid state, disappearing with increasing temperature.