Thermal decomposition of ammonium uranates precipitated from uranyl nitrate solution with ammonium hydroxide |
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| Authors: | Taichi Sato Fusaji Ozawa Shigeaki Shiota |
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| Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Shizuoka University, Hamamatsu Japan |
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| Abstract: | ![]()
Thermal decomposition of ammonium uranates precipitated from uranyl nitrate solutions on addition of aqueous ammonium hydroxide under various conditions has been examined by thermogravimetry (TG), differential thermal analysis (DTA), infrared spectroscopy and X-ray diffraction study. The TG curves of all precipitates show the weight-loss corresponding to the calculated value as UO3·NH3·H2O. The DTA curves of the precipitates give the endotherms at about 130, 210 and 590 °C and the exotherms at 340–420 °C. As a result, it is found that ammonium uranates thermally decompose to amorphous UO3 at about 400 °C, and transform to U3O8 via β-UO3. |
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| Keywords: | Author to whom correspondence should be addressed. |
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