Abstract
Abstract 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, [UO2(PO3)2]n 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, UP2O7, starts. 5) Finally, almost pure uranium(IV) diphosphate is produced at 1200°C.
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