CsAlZr2(PO4)4: an anhydrous aluminium zirconium phosphate with a novel three‐dimensional framework

Caesium aluminium dizirconium tetrakisphosphate(V)], CsAlZr₂(PO₄)₄, has been synthesized by high‐temperature reaction and studied by single‐crystal X‐ray diffraction at room temperature. This represents the first detailed structural analysis of an anhydrous phosphate containing both zirconium and aluminium. The structure features a complicated three‐dimensional framework of AlZr₂(PO₄)₄] constructed by PO₄, AlO₄ and ZrO₆ polyhedra interconnected via corner‐sharing O atoms, and one‐dimensional Cs chains which are located in the infinite tunnels within the AlZr₂(PO₄)₄] framework, which run along the c axis. The Cs, Al, one P and two O atoms lie on a mirror plane, while a second P atom lies on a twofold axis.