| Names | |
|---|---|
| IUPAC name Iron(III) sulfide | |
| Other names Iron sesquisulfide Ferric sulfide Diiron trisulfide | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider | |
| EC Number |
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| UNII | |
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| Properties | |
| Fe2S3 | |
| Molar mass | 207.90 g/mol[1] |
| Appearance | yellow-green[1] |
| Density | 4.3 g/cm3[1] |
| Melting point | decomposition[1] |
| 0.0062g/L[1] | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Iron(III) sulfide, also known as ferric sulfide or sesquisulfide (Fe
2S
3), is one of the several binaryiron sulfides. It is a solid, black powder that degrades at ambient temperature.[2]
Fe
2S
3 precipitates from solutions containing its respective ions:[2]
The resulting solid decays at a temperature over 20 °C intoiron(II) sulfide (FeS) andelemental sulfur:[3]
With hydrochloric acid it decays according to the following reaction equation:[4]
Greigite, with the chemical formulaFe2+Fe3+2S4, is amixed valence compound containing both Fe(III) and Fe(II). It is the sulfur equivalent of the iron oxidemagnetite (Fe3O4). As established byX-ray crystallography, the S anions form a cubic close-packed lattice, and the Fe cations occupy both tetrahedral and octahedral sites.[5]
