Iron(II,III) oxide

Iron(II,III) oxide
Names
	IUPAC name iron(II) iron(III) oxide
	Other names ferrous ferric oxide, ferrosoferric oxide, iron(II,III) oxide, magnetite, black iron oxide, lodestone, rust, iron(II) diiron(III) oxide
Identifiers
CAS Number	1317-61-9 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:50821 ;
ChEMBL	ChEMBL1201867 ;
ChemSpider	17215625 ;
ECHA InfoCard	100.013.889
PubChem CID	16211978;
UNII	XM0M87F357 ;
CompTox Dashboard (EPA)	DTXSID5029639 ;
	InChI InChI=1S/3Fe.4O Key: SZVJSHCCFOBDDC-UHFFFAOYSA-N ; InChI=1/3Fe.4O/rFe3O4/c1-4-2-6-3(5-1)7-2 Key: SZVJSHCCFOBDDC-QXRQKJBKAR;
	SMILES O1[Fe]2O[Fe]O[Fe]1O2;
Properties
Chemical formula	Fe3O4; FeO.Fe2O3
Molar mass	231.533 g/mol
Appearance	solid black powder
Density	5 g/cm3
Melting point	1,597 °C (2,907 °F; 1,870 K)
Boiling point	2,623 °C (4,753 °F; 2,896 K)
Refractive index (nD)	2.42
Hazards
NFPA 704 (fire diamond)	0 0 1 OX
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	-1120.89 kJ·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iron(II,III) oxide, or black iron oxide, is the chemical compound with formula Fe₃O₄. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe₂O₃) which also occurs naturally as the mineral hematite. It contains both Fe²⁺ and Fe³⁺ ions and is sometimes formulated as FeO ∙ Fe₂O₃. This iron oxide is encountered in the laboratory as a black powder. It exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic.^[4] Its most extensive use is as a black pigment (see: Mars Black). For this purpose, it is synthesized rather than being extracted from the naturally occurring mineral as the particle size and shape can be varied by the method of production.^[5]

^ Magnetite (Fe3O4): Properties, Synthesis, and Applications Lee Blaney, Lehigh Review 15, 33-81 (2007). See Appendix A, p.77
^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
^ Chase MW (1998). "NIST-JANAF Themochemical Tables". NIST (Fourth ed.): 1–1951.
^ Greenwood NN, Earnshaw A (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ Cornell RM, Schwertmann U (2007). The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses. Wiley-VCH. ISBN 978-3-527-60644-3.

[1] Magnetite (Fe3O4): Properties, Synthesis, and Applications Lee Blaney, Lehigh Review 15, 33-81 (2007). See Appendix A, p.77

[2] Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8

[3] Chase MW (1998). "NIST-JANAF Themochemical Tables". NIST (Fourth ed.): 1–1951.

[Greenwood-4] Greenwood NN, Earnshaw A (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[Cornell-5] Cornell RM, Schwertmann U (2007). The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses. Wiley-VCH. ISBN 978-3-527-60644-3.

[1]

[2]

[3]

[4]

[5]