The entropy and heat capacity of nickel chloride dihydrate

5 The entropy and heat capacity of nickel chloride dihydrate 

Polgar et al. [72POL/HER] measured the specific heat of NiCl2-2H20(cr) for temperatures between 1.2 and 24.5 K. Peaks were observed at 6.31 and 7.26 K, and at lower temperatures the heat capacity values are not a simple function of T. The authors estimated that the contribution to the molar entropy between 0 and 1.2 K is 0.03 R. Using an adiabatic calorimeter, Juraitis et al [90JUR/DOM] measured the heat capacity of the solid between 80 and 281 K, with emphasis on the effects of the structural transition near 220 K. It is not clear from these results (only reported graphically) whether the results from 250 to 281 K can be extrapolated smoothly to 298.15 K. 

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V,4.1.3.5 The entropy and heat capacity of nickel chloride dihydrate... 

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