Thermal analysis of various chromium compounds using TGA and DSC methods: a comparative investigation

This study explored thermal behavior of four kinds of chromium compounds such as CrO₃, K₂Cr₂O₇, K₂CrO₄, and Cr₂O₃ using thermogravimetry (TG) and differential scanning calorimetry (DSC) method under the oxygen (O₂) and nitrogen (N₂) gas atmosphere at varying temperatures (25 to 1600 ℃). A diverse of chromium compounds were carefully evaluated for the first time through this method, and the present work provides new, comprehensive and valuable information regarding the mentioned compounds. XRD technique and elemental analysis were applied in order to recognize the products at diverse decomposition stages. The obtained products were then investigated via a SEM electron microscope. Also, the form and the size of crystals were explored. Interestingly, the results obtained from both TG and DSC experiments in O₂ and N₂ atmospheres were identical. The thermodynamic data obtained from DSC experiments are reported in this work. Along with ∆H for each peak. It was shown that the decomposition product of K₂Cr₂O₇ was also a mixture of Cr₂O₃ and K₂CrO₄ at 1400 °C.

This study explored thermal behavior of four kinds of chromium compounds such as CrO₃, K₂Cr₂O₇, K₂CrO₄, and Cr₂O₃ using thermogravimetry (TG) and differential scanning calorimetry (DSC) method under the oxygen (O₂) and nitrogen (N₂) gas atmosphere at varying temperatures (25 to 1600 ℃). A diverse of chromium compounds were carefully evaluated for the first time through this method, and the present work provides new, comprehensive and valuable information regarding the mentioned compounds. XRD technique and elemental analysis were applied in order to recognize the products at diverse decomposition stages. The obtained products were then investigated via a SEM electron microscope. Also, the form and the size of crystals were explored. Interestingly, the results obtained from both TG and DSC experiments in O₂ and N₂ atmospheres were identical. The thermodynamic data obtained from DSC experiments are reported in this work. Along with ∆H for each peak. It was shown that the decomposition product of K₂Cr₂O₇ was also a mixture of Cr₂O₃ and K₂CrO₄ at 1400 °C.