P. Zeng, Yuancheng Teng, Yi Huang
Sep 1, 2014
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Influential Citations
18
Citations
Journal
Journal of Nuclear Materials
Abstract
Abstract Praseodymium was used as the surrogate for trivalent minor actinide neptunium, and a complete series of pure monazite-type Ce 1− x Pr x PO 4 ( x = 0–1) solid solutions were successfully prepared by the solid state reaction. The effects of calcining temperature, holding time and Pr content on the structure of Ce 1− x Pr x PO 4 solid solutions were investigated. The results show that although Pr 6 O 11 (Pr 2 3+ Pr 4 4+ O 11 ) exists two stabilized oxidation states, there has been no tetravalent praseodymium phosphate during the synthesis process. The optimized temperature for the synthesis of Ce 0.8 Pr 0.2 PO 4 solid solution is more than 1100 °C, and a hypothetical reaction mechanism is also proposed. Besides, the crystalline grains coarsen as the increasing of holding time. The linear variation of unit cell parameters and a gradual hypsochromic shift in the Raman spectra are observed with the increase of Pr content, indicating that cerium is progressively replaced by praseodymium and Ce 1− x Pr x PO 4 solid solutions were prepared.