Abstract
The formation of both PuPO 4 and PuP 2O 7 from reactions of PuO 2 with (NH 4) 2HPO 4 or BPO 4 was studied by X-ray diffraction and Raman spectroscopy. The oxidation of plutonium(III), in PuPO 4, to plutonium(IV), in PuP 2O 7, by air in the presence of BPO 4 and the thermal reduction of PuP 2O 7 to PuPO 4 were demonstrated. In addition plutonium(III) trimetaphosphate Pu(PO 3) 3 was synthesized and characterized. Attempts to prepare plutonium(IV) orthophosphate, Pu 3(PO 4) 4, by high temperature reactions were unsuccessful; instead, mixtures of PuP 2O 7 and a new phase identified tentatively as “(PuO) 2P 2O 7” were obtained.
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