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Names | |
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IUPAC name
Iron(II) oxide
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Other names
Ferrous oxide, Iron monoxide, Wüstite
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.014.292 |
13590 | |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
FeO | |
Molar mass | 71.844 g/mol |
Appearance | black crystals |
Density | 5.745 g/cm3 |
Melting point | 1,377 °C (2,511 °F; 1,650 K)[1] |
Boiling point | 3,414 °C (6,177 °F; 3,687 K) |
Insoluble | |
Solubility | insoluble in alkali, alcohol dissolves in acid |
+7200·10−6 cm3/mol | |
Refractive index (nD)
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2.23 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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can be combustible under specific conditions[2] |
NFPA 704 (fire diamond) | |
200 °C (392 °F; 473 K) | |
Safety data sheet (SDS) | ICSC 0793 |
Related compounds | |
Other anions
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Iron(II) sulfide Iron(II) selenide Iron(II) telluride |
Other cations
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Manganese(II) oxide Cobalt(II) oxide |
Iron(II,III) oxide Iron(III) oxide | |
Related compounds
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Iron(II) fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite.[3][4] One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron(III) oxide (ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron deficient with compositions ranging from Fe0.84O to Fe0.95O.[5]