Synthesis and Characterization of Uranium(IV)-Bearing Members of the [NZP] Structural Family

Autor:	Barry E. Scheetz, D. M. Smith, Michael N. Spilde, D. K. Veirs, Janet A. Danis, D. R. Spearing, Wolfgang Runde, C. D. Tait, Heather T. Hawkins
Rok vydání:	1999
Předmět:	General Chemical Engineering chemistry.chemical_element General Chemistry Crystal structure Uranium Crystallography chemistry.chemical_compound chemistry Zirconium phosphate Potassium phosphate Materials Chemistry Powder diffraction Stoichiometry Monoclinic crystal system Solid solution
Zdroj:	Chemistry of Materials. 11:2851-2857
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm990209f
Popis:	The sodium dizirconium tris(phosphate) structural family ([NZP]) includes compounds that may be represented by the general formula M‘M‘ ‘1-3A2(PO4)3. The ability of KZr2(PO4)3, a member of the [NZP] structural family, to accommodate U(IV) on the octahedrally coordinated A site has been demonstrated for compounds in the series KZr2-xUx(PO4)3 (0 ≤ x ≤ 0.20). KU2(PO4)3, the end member of the series, was found to adopt a monoclinic structure with 9-fold coordination of U(IV) that does not belong to the [NZP] family. The compounds were prepared from sol−gel derived precursors in an argon environment. X-ray microanalyses indicated that the precursor powders had reacted fully to produce compounds of the expected stoichiometries. Rietveld refined X-ray powder diffraction data of KZr2-xUx(PO4)3 (0 ≤ x ≤ 0.20) confirmed a rhombohedral (R3c) structure and suggested random occupation of the A site by U/Zr. The presence of U(IV) was established by comparison of the UV/vis spectra of KZr2-xUx(PO4)3 (0 ≤ x ≤ 0.20) with...
Databáze:	OpenAIRE
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