THERMODYNAMIC INVESTIGATIONS OF THE SYSTEM GE-SN-TE

The excess enthalpies of liquid alloys in the ternary system Ge-Sn-Te were determined in a heatflow calorimeter along the sections GeySn1-y - Te with y = 0.2, 0.4, 0.5 and 0.6 at 1093 K, with y = 0.2, 0.4, 0.5, 0.6 and 0.8 at 1153 K and with y = 0.5 at 1213 K. The largest values of the exothermic enthalpies are found on a line stretching from GeTe to SnTe. The association model was applied for the analytical descript ion of the ternary liquid. Additional ternary interaction parameters h ad to be used for the calculation of the excess enthalpies which were obtained by adjusting the curves to the experimental data with the lea st squares method. The thermodynamic functions of the quasibinary sect ion Ge-SnTe were optimized and the phase equilibria calculated.