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

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

Sajadi, A. A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1007/s10973-024-13401-3
  3. Publisher: 2024
  4. Abstract:
  5. 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. © Akadémiai Kiadó, Budapest, Hungary 2024
  6. Keywords:
  7. Potassium chromate ; Potassium dichromate ; Thermogravimetry (TGA/DSC) ; Calorimeters ; Chromates ; Nitrogen ; Oxygen ; Potassium compounds ; Thermogravimetric analysis ; X ray diffraction ; Calorimetry experiment ; Chromium oxide (III) & (VI) ; Decomposition products ; Differential scanning calorimetry methods ; Gas atmosphere ; Thermal behaviours ; Thermodynamic data ; Varying temperature ; XRD technique ; Differential scanning calorimetry
  8. Source: Journal of Thermal Analysis and Calorimetry ; Volume 149, Issue 17 , 2024 , Pages 9035-9043 ; 13886150 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10973-024-13401-3