Yttrium phosphate, YPO₄, is the

phosphate Phosphates are the naturally occurring form of the element phosphorus. In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthop ...

salt of

yttrium Yttrium is a chemical element; it has Symbol (chemistry), symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare-earth element". Yttrium is almost a ...

. It occurs in nature as minerals

xenotime Xenotime is a rare-earth phosphate mineral, the major component of which is yttrium orthophosphate ( Y P O4). The phosphate ions are described by a tetrahedral shape and coordinate to the center Y3+ metal ion in a way that closely resembles the s ...

and weinschenkite.minsocam.org
WEINSCHENKITE, YTTRIUM PHOSPHATE DIHYDRATE
retrieved 16 May 2014

Preparation

Yttrium phosphate can be obtained by reacting yttrium chloride and

sodium phosphate A sodium phosphate is a generic variety of salts of sodium () and phosphate (). Phosphate also forms families or condensed anions including di-, tri-, tetra-, and polyphosphates. Most of these salts are known in both anhydrous (water-free) and ...

, or by reacting

yttrium nitrate Yttrium(III) nitrate is an inorganic compound, a salt with the formula Y(NO3)3. The hexahydrate is the most common form commercially available. Preparation Yttrium(III) nitrate can be prepared by dissolving corresponding metal oxide in 6 mol/ ...

and

diammonium hydrogen phosphate Diammonium phosphate (DAP; IUPAC name diammonium hydrogen phosphate; chemical formula (NH4)2(HPO4)) is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid. Solid diammonium phos ...

in solution: : : Yttrium phosphate can also be prepared by the reaction of

yttrium(III) oxide Yttrium oxide, also known as yttria, is Y2 O3. It is an air-stable, white solid substance. The thermal conductivity of yttrium oxide is 27 W/(m·K). Applications Phosphors Yttrium oxide is widely used to make Eu:YVO4 and Eu:Y2O3 phosphors th ...

and diammonium hydrogen phosphate: : Yttrium 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, ...

are mixed at 35~40°C, and then

ammonia solution Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH3(aq). Although ...

is added dropwise to react: :

Properties

Yttrium phosphate belongs to the

tetragonal crystal system In crystallography, the tetragonal crystal system is one of the 7 crystal systems. Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a squa ...

, and the

unit cell In geometry, biology, mineralogy and solid state physics, a unit cell is a repeating unit formed by the vectors spanning the points of a lattice. Despite its suggestive name, the unit cell (unlike a unit vector In mathematics, a unit vector i ...

parameters are ''a''=0.68832 nm, ''c''=0.60208 nm. It can exist as a monohydrate, dihydrate or the anhydrous form. The dihydrate belongs to 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 ...

, the

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 ...

is ''B 2/b'', and the unit cell parameters are ''a''=0.648 nm, ''b''=1.512 nm, ''c''=0.628 nm, β=129.4°, Z=4. Yttrium phosphate reacts with concentrated alkali to form

yttrium hydroxide Yttrium(III) hydroxide is an inorganic compound and an alkali with the chemical formula Y(OH)3. Production Yttrium(III) hydroxide can be produced by reacting yttrium(III) nitrate and sodium hydroxide in aqueous solution:田俐，陈稳纯，陈� ...

Uses

Yttrium phosphate is used as a catalyst and is a potential containment material for nuclear waste. Ce³⁺-doped yttrium phosphate shows luminescence in the UV range and can be used for tanning lamps. Double-doped materials such as Ce³⁺-Tb³⁺ have also been reported.

References

{{DEFAULTSORT:Yttrium Phosphate Phosphates Yttrium compounds