G. A. Sharpataya, K. Gavrichev, A. Khoroshilov
Nov 4, 2005
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Journal
Journal of Thermal Analysis and Calorimetry
Abstract
SummaryThe heat capacity of cesium hexafluoroarsenate, CsAsF6, was measured from 300 to 850 K by differential scanning calorimetry. The results indicate that the structural transformation from the rhombohedral to cubic phase, occurring in the range 235-360 K, relates to gradual transition completed isothermally. The enthalpy of the transition is 6.015±0.186 kJ mol-1, and its entropy is 17.21±0.58 J K-1 mol-1≈Rln8, which suggests that this structural transition belongs to the order-disorder type. The thermodynamic properties of CsAsF6 were evaluated in the range 10-760 K.