GLASS-TRANSITION AND SPECIFIC-HEATS IN THE SYSTEMS P-S, P-SE, AS-S AND AS-SE

The glass transition temperatures were measured in the systems AsS, As0.5P0.5S, PSe, AsSe and PAsSe. Heat capacities of the glasses in the selenium systems were obtained by differential scanning calorimetry. As shown by the residual entropies departures from ideality are high in the chalcogen glasses. The results are discussed in terms of the structure of glasses in these systems. The thermodynamic data of glasses and liquids in these systems indicate a balance of intra- and intermolecular saturation of bonds. The amount of polymerization increases with increasing average molecular weight in the glass and with increasing temperature in some of the investigated liquids. © 1979.