Abstract
Measurements of heat capacities for liquid SbSe and BiSe alloys were carried out up to 800°C using an adiabatic scanning calorimeter. Anomalous temperature variation of heat capacity was observed for liquid Sb 0.45Se 0.55, Sb 0.5Se 0.5 and Bi 2Se 3 alloys. Broad maxima were observed in the temperature dependence of their heat capacities. In contrast, the heat capacity for liquid Sb 2Se 3 alloys shows little temperature variation. In the concentration dependence, the maximum of the heat capacity deviates from the stoichiometric composition of M 2Se 3 in both alloy systems. The characteristic behaviour of the heat capacities for liquid SbSe and BiSe alloys can be attributed to a change in intermediate-range order and in local bonding.
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