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Thermal and kinetic analysis of uranium salts

Part III. Uranium(IV) oxalate hydrates

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Abstract

Thermal decomposition of U(C2O4)2·6H2O was studied using TG method in nitrogen, air, and oxygen atmospheres. The decomposition proceeded in five stages. The first three stages were dehydration reactions and corresponded to removal of four, one, and one mole water, respectively. Anhydrous salt decomposed to oxide products in two stages. The decomposition products in nitrogen atmosphere were different from those in air and oxygen atmospheres. In nitrogen atmosphere UO1.5(CO3)0.5 was the first product and U2O5 was the second product, while these in air and oxygen atmospheres were UO(CO3) and UO3, respectively. The second decomposition products were not stable and converted to stable oxides (nitrogen: UO2, air–oxygen: U3O8). The kinetics of each reaction was investigated with using Kissinger–Akahira–Sunose and Flynn–Wall–Ozawa methods. These methods were combined with modeling equations for thermodynamic functions, the effective models were investigated and thermodynamic values were calculated.

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Acknowledgements

This study was financially supported by the Turkish Scientific and Technological Research Council through Grant # 107T293(TBAG-HD/282) and by Pamukkale University through Grant # 2009FBE001.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Technology Faculty, Pamukkale University, 20070, Denizli, Turkey

    Gülbanu Koyundereli Çılgı

  2. Department of Chemistry, Faculty of Science and Arts, Pamukkale University, 20070, Denizli, Turkey

    Halil Cetişli & Ramazan Donat

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  1. Gülbanu Koyundereli Çılgı
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  2. Halil Cetişli
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Correspondence to Gülbanu Koyundereli Çılgı.

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Çılgı, G.K., Cetişli, H. & Donat, R. Thermal and kinetic analysis of uranium salts. J Therm Anal Calorim 115, 2007–2020 (2014). https://doi.org/10.1007/s10973-013-3341-7

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  • DOI: https://doi.org/10.1007/s10973-013-3341-7

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