THERMODYNAMIC INVESTIGATION OF THE AG-TE AND CU-TE EUTECTIC ALLOYS

The heat contents of solid and liquid rich-Te Ag-Te and Cu-Te eutectic s from 298 K to T (421< T< 820 K and 512 < T < 800 K respectively) wer e measured on heating (drop method) with the help of a high temperatur e Tian-Calvet calorimeter. The heat capacity of both liquid and solid eutectics as well as their enthalpies of fusion were deduced. The ther modynamic behaviour of the two eutectics in the liquid state appear ve ry simple. Their strong short-range orders can be explained by one kin d of associate the stoichiometry of which corresponds to the single co ngruently melting compound of the systems, i.e. Ag2Te and Cu2Te respec tively. Then, the two eutectics investigated can be considered as refe rence systems for our further works on weakly associated alloys.