Debye temperatures and cohesive properties

摘要

Values of crystallinehyphen;solid Debye temperatures depend both on the method and temperature of measurement. Simple relationships between Debye temperatures and such cohesive properties as compressibility and melting point were derived over 60 years ago by Madelung, by Einstein, and by Lindemann. Debye temperatures THgr;XRof a number of piezoelectric semiconductors with chalcopyrite structure have been determined at room temperature by xhyphen;ray diffraction. A new series of heat capacity measurements over the temperature range 1.2ndash;40thinsp;deg;K, for four chalcopyrites, give THgr;Dvalues at 0thinsp;deg;K. A common proportionality is found between each of these THgr;XRand THgr;Dvalues and microhardness, and also melting point: Acceptable reproducibility is given for theAIBIIICVI2chalcopyrites and, separately, theAIIBIVCV2compounds. Values of THgr; are predicted for 15 additional chalcopyrites. Excellent proportionality between THgr;elasticand compressibility is found for the europium chalcogenides, based on the data of Shapira and Reed.