Iron(III) phosphate

Iron(III) phosphate
Names
	IUPAC name Iron(III) phosphate
	Other names Ferric orthophosphate, Ferric phosphate
Identifiers
CAS Number	10045-86-0 (anhydrous); 13463-10-0 (dihydrate);
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:131371 ;
ChemSpider	23244 ;
ECHA InfoCard	100.030.123
PubChem CID	24861;
UNII	N6BAA189V1 ;
CompTox Dashboard (EPA)	DTXSID9035672 ;
	InChI InChI=1S/Fe.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+3;/p-3 Key: WBJZTOZJJYAKHQ-UHFFFAOYSA-K ;
	SMILES [O-]P(=O)([O-])[O-].[Fe+3];
Properties
Chemical formula	FePO4
Molar mass	150.815 g/mol (anhydrous)
Appearance	yellow-brown solid
Density	3.056 g/cm3 (anhydrous); 2.87 g/cm3 (20 °C, dihydrate)
Melting point	250 °C (482 °F; 523 K) ; (dihydrate) decomposes
Solubility in water	anhydrous:; insoluble; dihydrate:; 0.642 g/100 mL (100 °C)
Solubility product (Ksp)	9.91×10−16
Magnetic susceptibility (χ)	+11,500.0·10−6 cm3/mol
Thermochemistry
Heat capacity (C)	180.5 J/mol·K (dihydrate)
Std molar; entropy (S⦵298)	171.3 J/mol·K (dihydrate)
Std enthalpy of; formation (ΔfH⦵298)	-1888 kJ/mol (dihydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P305+P351+P338
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iron(III) phosphate, also ferric phosphate, is the inorganic compound with the formula FePO₄. Four polymorphs of anhydrous FePO₄ are known. Additionally two polymorphs of the dihydrate FePO₄·(H₂O)₂ are known. These materials have attracted much interest as potential cathode materials in batteries.

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