Thermal Decomposition of Uranyl Dihydrogen Orthophosphate Trihydrate

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概要

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• The thermal decomposition of uranyl dihydrogen orthophosphate trihydrate was studied by means of paper chromatography, X-ray diffractometry, differential thermal analysis, thermogravi-metric analysis, infrared spectroscopy and chemical analysis. From these studies, it was revealed that in the thermal decomposition of the uranyl salt the following reactions take place. 1) The formation of condensed phosphates with relatively small polymerization degrees such as di- and triphosphates takes place below 300°C, accompanied by the elimination of water. 2) A uranyl salt of long-chain metaphosphate, [UO<SUB>2</SUB>(PO<SUB>3</SUB>)<SUB>2</SUB>]<I><SUB>n</SUB></I> is produced bewteen 300 and 840°C. 3) The metaphosphate is melted at about 900°C, while uranium(VI) is reduced to uranium(IV) at the same time. 4) As a result of the reduction, the formation of uranium(IV) diphosphate, UP<SUB>2</SUB>O<SUB>7</SUB>, starts. 5) Finally, almost pure uranium(IV) diphosphate is produced at 1200°C.

• 公益社団法人 日本化学会の論文

著者

• Ohashi Shigeru

  Department of Chemistry Faculty of Science Kanazawa University

• Kamo Mutsukazu

  Department of Chemistry, Faculty of Science, Kyushu University

• Ohashi Shigeru

  Department of Chemistry, Faculty of Science, Kyushu University

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• Spectrophotometric determination of silicic acid by flow injection analysis.
• The reaction of cyclo-tetraphosphate with L-valine.
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• MECHANISM OF ANTI-DIABETIC ACTIVITY OF CALCIUM MESOXALATE
• The pH Dependence of Anion Exchange Chromatographic Separation of Tri- and Tetraphosphate Anions

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