Crystal structures of Th(OH)PO4, U(OH)PO4 and Th2O(PO4)2.: Condensation mechanism of MIV(OH)PO4 (M = Th, U) into M2O(PO4)2

被引：38

作者：

Dacheux, Nicolas

Clavier, Nicolas

Wallez, Gilles

Quarton, Michel

机构：

[1] Univ Paris 06, CNRS, UMR 7574, F-75005 Paris, France

[2] Univ Paris 11, IPNO, Grp Radiochim, UMR 8608, F-91406 Orsay, France

来源：

SOLID STATE SCIENCES | 2007年 / 9卷 / 07期

关键词：

X-ray diffraction; Raman spectroscopy; crystal structure; radwaste matrix; actinide phosphate; condensation mechanism;

D O I：

10.1016/j.solidstatesciences.2007.04.015

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Three new crystal structures, isotypic with beta-Zr2OWO4)(2), have been resolved by the Rietveld method. All crystallize with an orthorhombic cell (S.G.: Cmca) with a = 7.1393(2) angstrom, b = 9.2641(2) angstrom, c = 12.5262(4) angstrom, V= 828.46(4) angstrom(3) and Z = 8 for Th(OH)PO4; a = 7.0100(2) angstrom, b=9.1200(2)angstrom, c=12.3665(3)angstrom, V=790.60(4)angstrom(3) and Z=8 for U(OH)PO4; a=7.1691(3)angstrom, b=9.2388(4)angstrom, c=12.8204(7)angstrom, V = 849.15(7) angstrom(3) and Z = 4 for Th2O(PO4)(2). By heating, the M(OH)PO4 (M = Th, U) compounds condense topotactically into M2O(PO4)(2), with a change of the environment of the tetravalent cation that lowers from 8 to 7 oxygen atoms. The lower stability of Th2O(PO4)(2) compared to that of U2O(PO4)(2) seems to result from this unusual environment for tetravalent thorium. (c) 2007 Elsevier Masson SAS. All rights reserved.

引用

页码：619 / 627

页数：9

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