The heat capacity of the dichalcogenide: tungsten ditelluride, WTez, was measured over the temperature range 5.5 < T/K < 329 using adiabatic calorimetry. Our results show that a phase transition is not present. However, an anomalous rise in the molar heat capacity Cp,,1 occurs in the region 92 < T/K < 175. The molar entropy change of this rise amounts to ASs= (0.10_+ 0.02). R. The anomaly coincides with the temperature range where all the translational, librational, and internal vibrational modes become fully excited. The electronic molar heat capacity TVm = (5.99_+ 1.83) mJ. K-1 .mol-1 and, for the lattice, the Debye characteristic temperature O D = (133.8 +0.6)K. Standard molar thermodynamic functions are presented at selected temperatures from 5 K to 335 K.
This paper describes an assessment of the behavior of a differential scanning calorimeter and the development of satisfactory calibration, operation, and data reduction procedures, which depend on performance characteristics of the individual instrument. Factors that contribute to thermal lag are identified; suggestions for evaluating and compensating for it are given.
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