Abstract
The isobaric molar heat capacities of powder of Co 2O 3 were determined by an adiabatic calorimeter in the temperature range from 78 to 350 K. No phase transition takes place in this temperature range. The relationship of C p,m with thermodynamic temperature T was established as C p,m=−5×10 −6 T 3+0.0026 T 2+0.0325 T+4.2592 (J K −1 mol −1), fitting coefficient R 2=0.9996. According to this relationship and the relationships between thermodynamic functions, the thermodynamic functions of powder of Co 2O 3 were derived with 298.15 K as reference temperature. Thermal decomposition of Co 2O 3 powder was studied through thermogravimetry (TG). The possible mechanism of the thermal decomposition reaction was suggested according to the TG result.
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