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The enthalpy contents of Cu 2 Se, Cu 2 Te, Ag 2 Se and Ag 2 Te at temperatures between 350 K to 50 K above the melting points were measured in an isoperibolic drop-calorimeter. Thermodynamic data of the compounds were derived from these measurements. An analysis of the data leads to the conclusion that a high degree of order is retained in the melts of these compounds, and that the bond character of these melts is partially ionic. An unusual decrease of C p  with increasing temperature immidiately after the transition temperatures could be confirmed.

Enthalpien von Kupfer- und Silberchalkogeniden / Enthalpies of Copper and Silver Chalcogenides