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DOI: 10.1039/A904121D (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 2583-2587

New thorium and uranium monophosphates in the KTh2(PO4)3 family: structure and cationic non-stoichiometry

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Anne Guesdon, Jackie Provost and Bernard Raveau

Abstract

A new uranium monophosphate KU2(PO4)3 has been synthesized. The structure of this phase, isotypic with KTh2(PO4)3, has been determined using a single crystal. The analysis of this structure leads to a new description, in which the [U2(PO4)3]∞ framework, built up of edge- and corner-sharing PO4 tetrahedra and UO9 polyhedra, forms eight-sided tunnels. New non-stoichiometric phosphates, A0.5Th2(PO4)3 with A = Ba, Sr, Pb, Ca, Cd and K1–2xBaxTh2(PO4)3, have been synthesized, showing the great flexibility of this structure.

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