Iron(III) phosphate, also ferric phosphate, is the inorganic compound with the formula FePO4. Several
related materials are known, including four polymorphs of FePO4 and two polymorphs of the dihydrate FePO4ˇ(H2O)2.
These materials find several technical applications as well as occurring in the mineral kingdom.
Iron(III) phosphate is one of the few molluscicides approved for use in the practice of organic farming, but unlabelled addition of EDTA contradicts such labelling.
It can be used in steel and metal manufacturing processes. When bonded to a metal surface, iron phosphate prevents further oxidation of the metal. Its presence is partially responsible for the corrosion resistance of the iron pillar of Delhi.
Iron phosphate coatings are also primarily used as base coatings for paint in order to increase adhesion to the iron or steel substrate, and is often used in rustproofing as well. It can also be used for bonding fabrics, wood, and other materials to these surfaces as well. Iron phosphate coatings are usually applied as part of a painting or powder coating process.
Iron phosphate can also be used as an intercalation electrode in a lithium-ion battery despite having low electronic conductivity. However, in recent years its use as an electrode material has been increasingly more common as materials engineers have overcome the electronic conductivity issue.
FePO4 is an ideal electrode material for batteries in electric vehicles due to its thermal stability and generally good cyclability.
Chemical formula FeO4P
Molar mass 150.81 gˇmol
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)
Solubility in water anhydrous:
0.642 g/100 mL (100 °C)
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