Abstract
The thermal decomposition of cobalt oxalate dihydrate was thoroughly investigated in dynamic air or nitrogen. Thermal events occurring throughout the decomposition range (room temperature to 600 °C) were monitored by means of thermogravimetry (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC). These events were characterized on the bases of physicochemical analyses using X-ray diffractometry (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Non-isothermal kinetic and thermodynamic parameters ( A, k, ΔE, ΔH, C p and ΔS) were determined. The results obtained showed that the oxalate dehydrates in dynamic nitrogen atmosphere at slightly lower temperature (150 °C) than in air (160 °C), while the decomposition commenced at higher temperature in nitrogen (350 °C) than in air (270 °C). The product of decomposition in air was found to be Co 3O 4 while in nitrogen, metallic cobalt was the final product. The decomposition process in nitrogen was endothermic in nature, while in air it occurred exothermically, which was attributed to an oxidative decomposition process involving atmospheric oxygen.
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