Potassium gadolinium polyphosphate, KGd(PO(3))(4).

Potassium gadolinium polyphosphate, KGd(PO(3))(4), was synthesized using the flux method. The atomic arrangement consists of an infinite long-chain polyphosphate organization. Two types of chains, with a period of eight PO(4) tetrahedra, run along the [101] direction. The Gd atoms have an eightfold coordination, while the K atoms have nine O-atom neighbours.