Praseodymium(III) phosphate is an

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

with the

chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...

PrPO₄.

Preparation

Praseodymium(III) phosphate hemihydrate can be obtained by reacting praseodymium chloride and

phosphoric acid Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid) is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula . It is commonly encountered as an 85% aqueous solution, ...

: : It can also be produced by reacting

silicon pyrophosphate Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid (sometimes considered a non-metal) and semiconductor. It is a member ...

(SiP₂O₇) and

praseodymium(III,IV) oxide Praseodymium(III,IV) oxide is the inorganic compound with the formula that is insoluble in water. It has a cubic fluorite structure. It is the most stable form of praseodymium oxide at ambient temperature and pressure. Properties and structure ...

(Pr₆O₁₁) at 1200 °C.

Properties

Praseodymium(III) phosphate forms light green crystals in the

monoclinic crystal system In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic sy ...

, with

space group In mathematics, physics and chemistry, a space group is the symmetry group of a repeating pattern in space, usually in three dimensions. The elements of a space group (its symmetry operations) are the rigid transformations of the pattern that ...

''P''2₁/''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·''n''H₂O, where n < 0.5, with light green crystals of

hexagonal crystal system In crystallography, the hexagonal crystal family is one of the six crystal family, crystal families, which includes two crystal systems (hexagonal and trigonal) and two lattice systems (hexagonal and rhombohedral). While commonly confused, the tr ...

, space group ''P6₂22'', and cell parameters ''a'' = 0.700 nm, ''c'' = 0.643 nm, Z = 3. Praseodymium(III) phosphate reacts with

sodium fluoride Sodium fluoride (NaF) is an inorganic compound with the formula . It is a colorless or white solid that is readily soluble in water. It is used in trace amounts in the fluoridation of drinking water to prevent tooth decay, and in toothpastes ...

to obtain Na₂PrF₂(PO₄). :

References

{{Phosphates Praseodymium(III) compounds Phosphates