title: An ortho-rhom-bic polymorph of the ultraphosphate YP(5)O(14).
abstract: Single crystals of yttrium penta-phosphate(V), YP(5)O(14), were obtained by solid-state reaction. The ortho-rhom-bic title compound belongs to the family of ultraphosphates and is the second polymorph of this composition. It is isotypic with its Ho and Er analogues. The structure contains two bridging Q(2)-type PO(4) tetra-hedra and one branching Q(3)-type PO(4) tetra-hedron, leading to infinite ultraphosphate ribbons running along the a axis. The coordination polyhedron around the Y(3+) cation may be described as distorted bicapped trigonal-prismatic. The YO(8) polyhedra are isolated from each other. They are linked by corner-sharing to the O atoms of six Q(2)-type and of two Q(3)-type PO(4) tetra-hedra into a three-dimensional framework.
authors.forename: Aïcha
authors.initials: A
authors.lastname: Mbarek
authors.forename: Abdelghani
authors.initials: A
authors.lastname: Oudahmane
authors.forename: Malika
authors.initials: M
authors.lastname: El-Ghozzi
authors.forename: Daniel
authors.initials: D
authors.lastname: Avignant