Thermodynamic Properties of CoS 0.89, CoS,1.33' and CoS2; Bureau of Mines Report of Investigations -1985 RI 8994
Description:In this Bureau of Mines investigation, the low-temperature heat capacities of polycrystalline phases corresponding to the sulfide compounds CoSO•89' CoS1•33, and CoS2 were measured by adiabatic calorimetry within the nominal temperature range 5 to 300 K. The derived absolute entropies S298 were 10.36±O.02, 12.96±O.03, and 16.31±O.03 cal•mol-1•K-l, respectively, assuming third-law behavior. In addition, the standard enthalpy of formation 8Hf298 of CoSO•89 was determined by bromine solution calorimetry. The derived value of 8Hf298 was -50.63±2.1 kcal•mol-1, based on the 8Hf298 of Co0. This result is considerably more negative than previously published formation values based on high-temperature gas equilibrium studies.
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