Abstract
The enthalpy and the heat capacity of CsI have been determined from 300 to 830 K by the drop calorimetry. The calorimeter was operated at 323 K and 520 K for normal and inverse drop procedure, respectively. Heat-capacity measurements were also made with use of a differential scanning calorimeter(DSC) from 300 to 520 K in order to confirm the results. The present results of heat capacity agree well and merge smoothly at 300 K with the published low-temperature values. The heat capacity-temperature curve was found to show a slight upward deviation above 400 K from the linear temperature dependence, which was analyzed to be caused by vacancy formation. By taking this into account, a heat-capacity equation for CsI was derived, which was applicable over the whole temperature range investigated. The thermal functions of CsI were calculated by using this equation from 298 to 899 K(melting point).
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