Abstract
In the present work the temperature dependence of heat capacity for hevein has been measured for the first time over the temperature range from 5 K to 344 K using by precision adiabatic vacuum calorimetry. Based on the experimental data, the thermodynamic functions of the hevein, namely, the heat capacity, enthalpy H°(T) − H°(0), entropy S°(T) − S°(0) and Gibbs function G°(T) − H°(0) have been evaluated from the experimental values for the range from T → 0 K to 344 K. The low-temperature X-ray diffraction was used for the determination of type phase transition at 222.8 K and coefficients of thermal expansion.
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