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  • 1 Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Technical University of Wroclaw, 50-370 Wroclaw, Poland
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Abstract  

The thermal decomposition of [Co(NH3)6]2(C2O4)3·4H2O was studied under isothermal conditions in flowing air and argon. Dissociation of the above complex occurs in three stages. The kinetics of the particular stages thermal decomposition have been evaluated. The RN and/or AM models were selected as those best fitting the experimental TG curves. The activation energies,E, and lnA were calculated with a conventional procedure and by a new method suggested by Kogaet al. [10, 11]. Comparison of the results have showed that the Arrhenius parameters values estimated by the use of both methods are very close. The calculated activation energies were in air: 96 kJ mol−1 (R1.575, stage I); 101 kJ mol−1 (Ain1.725 stage II); 185 kJ mol−1 (A2.9, stage III) and in argon: 66 kJ mol−1 (A1.25, stage I); 87 kJ mol−1 (A1.825, stage II); 133 kJ mol−1 (A2.525, stage III).