The thermodynamics of the divalent metal fluorides. II. Heat capacity of the fast ion conductor BaSnF4 from 7 to 345 K |
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| Authors: | J E Callanan R D Weir E F Westrum Jr |
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| Affiliation: | (1) Chemical Engineering Science Division, National Institute of Standards and Technology (formerly National Bureau of Standards), 80303 Boulder, Colorado, USA;(2) Department of Chemistry and Chemical Engineering, Royal Military College of Canada, K7K 5LO Kingston, Ontario, Canada;(3) Department of Chemistry, University of Michigan, 48109-1055 Ann Arbor, Michigan, USA |
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| Abstract: | The heat capacity of the fast ion conductor BaSnF4 was measured over the temperature range 7<T<345 K using adiabatic calorimetry. Our results show that a phase transition is not present. However, an anomalous rise in the molar heat capacity,C
p,m, occurs in the region 210<T<310 K; the entropy change of this rise amounts to S/R=0.112. This anomaly coincides with the temperature range where a break in the slope of the electrical conductivity has been observed, which results in a threefold decrease in the activation energy required in the temperature region above the break at 272 K. Standard molar thermodynamic functions are presented at selected temperatures from 5 to 345 K.Paper presented at the Tenth Symposium on Thermophysical Properties, June 20–23, 1988, Gaithersburg, Maryland, U.S.A. |
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| Keywords: | barium tetrafluorostannate fast ion conductor heat capacity low temperature |
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