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Crystal structures of lanthanide and zirconium phosphates with general formula Ln0.33Zr2(PO4)3, where Ln=Ce, Eu, Yb |
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| Authors: | DM Bykov YuK Kabalov SV Tomilin |
| Institution: | a Geological Department, Moscow State University, Moscow 119992, Russia b Chemical Department, Nizhny Novgorod State University, Nizhny Novgorod 603950, Russia c Waste Immobilization Laboratory, Chemical and Technological Department, Research Institute of Atomic Reactors, Dimitrovgrad - 10, Ulyanovsk region 433510, Russia |
| Abstract: | Crystal structures of synthetic phosphates Ce0.33Zr2(PO4)3, Eu0.33Zr2(PO4)3 and Yb0.33Zr2(PO4)3 have been refined by Rietveld method using powder diffraction data. Unit cell parameters: a=8.7419 (4), c=23.128 (2) Å; a=8.7659 (1), c=22.822 (1) Å; a=8.8078 (4), c=22.485 (3) Å, respectively; Z=6. Values of final R-factors in isotropic approximation: Rwp=4.00, Rwp=3.33, Rwp=4.12%, respectively. New space group P3¯c has been established for the compounds with general formula Ln0.33Zr2(PO4)3, where Ln=Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y. It has been confirmed that the synthetic phosphates with general formula Ln0.33Zr2(PO4)3 belong to the NZP (sodium zirconium phosphate) structure type. |
| Keywords: | Lanthanides Framework phosphates NZP Crystal structure Refinement Rietveld method |
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