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The heat capacity of the fast ion conductor BaSnF 4 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 ΔS/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

The thermodynamics of the divalent metal fluorides. II. Heat capacity of the fast ion conductor BaSnF4 from 7 to 345 K