New thorium and uranium monophosphates in the KTh2(PO4)3 family: structure and cationic non-stoichiometry
Abstract
A new uranium monophosphate KU
2
(PO
4
)
3
has been synthesized. The structure of this phase, isotypic with KTh
2
(PO
4
)
3
, has been determined using a single crystal. The analysis of this structure leads to a new description, in which the [U
2
(PO
4
)
3
]
∞
framework, built up of edge- and corner-sharing PO
4
tetrahedra and UO
9
polyhedra, forms eight-sided tunnels. New non-stoichiometric phosphates, A
0.5
Th
2
(PO
4
)
3
with A = Ba, Sr, Pb, Ca, Cd and K
1–2x
Ba
x
Th
2
(PO
4
)
3
, have been synthesized, showing the great flexibility of this structure.
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