K2Ho(PO4)(WO4)

A new compound, dipotassium holmium(III) phosphate(V) tungstate(VI), K2Ho(PO4)(WO4), has been obtained during investigation of the K2O-P2O5-WO3-HoF3 phase system using the flux technique. The compound is isotypic with K2Bi(PO4)(WO4). Its framework structure consists of flat (2)(infinity)[HoPO4] layers parallel to (100) that are made up of (1)(infinity)[HoO8] zigzag chains interlinked via slightly distorted PO4 tetrahedra. WO4 tetrahedra are attached above and below these layers, leaving space for the K+ counter-cations. The HoO8, PO4 and WO4 units exhibit 2 symmetry.