Praseodymium(III) phosphate

Praseodymium phosphate is an inorganic compound with the chemical formula PrPO₄.

Preparation

Praseodymium phosphate hemihydrate can be obtained by reacting praseodymium chloride and phosphoric acid:
It can also be produced by reacting silicon pyrophosphate and praseodymium(III,IV) oxide at 1200 °C.

Properties

Praseodymium phosphate forms light green crystals in the monoclinic crystal system, with space group P2₁/n and cell parameters a = 0.676 nm, b = 0.695 nm, c = 0.641 nm, β = 103.25°, Z = 4.
It forms a crystal hydrate of the composition PrPO₄·nH₂O, where n < 0.5, with light green crystals of hexagonal crystal system, space group P6₂22, and cell parameters a = 0.700 nm, c = 0.643 nm, Z = 3.
Praseodymium phosphate reacts with sodium fluoride to obtain Na₂PrF₂.