Abstract
The title compound dipotassium gadolinium(III) phosphate(V) molybdate(VI), K(2)Gd(PO(4))(MoO(4)), was synthesized from a high-temperature melt starting from GdF(3) as a source of gadolinium. Its structure is isotypic with other M (I) (2) M (III)(M (VI)O(4))(PO(4)) compounds, where M (I) = Na, K or Cs, and M (III) = rare-earth cation, M (VI) = Mo or W. The three-dimensional framework is built up from [Gd(PO(4))(MoO(4))] anionic sheets, which are organized by adhesion of [GdPO(4)] layers and [MoO(4)] tetra-hedra stacked above and below these layers. The inter-stitial space is occupied by K cations having eightfold oxygen coordination. The polyhedron of GdO(8) was estimated to be a triangular dodeca-hedron by the continuous shape measurement method.