Investigations of new binary phosphate K4Ce2P4O15

The new potassium cerium(III) phosphate of formula K4Ce2P4O15 in the system Ce2O3–K2O–P2O5 was prepared by solid state reactions and characterized by thermal analysis (DTA, TG, DSC), powder X-ray diffraction and IR spectroscopy. This compound exists only in the solid state (below 880 °C) and exhibits a polymorphic transition at 527 °C. The low-temperature form β-K4Ce2P4O15 of this compound crystallizes as a triclinic phase (space group P) with unit cell parameters: a=9.319(7), b=12.129(3), c=9.252(1) Å, α=106.875, β=100.086, γ=107.202°, V=916.276 Å3.