Iron(III) sulfide, also known as ferric sulfide or sesquisulfide (Fe
2S
3), is one of the several binary iron sulfides. It is a solid, black powder that degrades at ambient temperature.[2]
Names | |
---|---|
IUPAC name
Iron(III) sulfide | |
Other names
Iron sesquisulfide Ferric sulfide Diiron trisulfide | |
Identifiers | |
ChEBI | |
PubChem CID |
|
UNII | |
CompTox Dashboard (EPA) |
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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 their standard state (at 25 °C [77 °F], 100 kPa).
|
Reactions
Fe
2S
3 precipitates from solutions containing its respective ions:[2]
- 2Fe3+ + 3S2− → Fe2S3
The resulting solid decays at a temperature over 20 °C into iron(II) sulfide (FeS) and elemental sulfur:[3]
- Fe2S3 → 2 FeS + S
With hydrochloric acid it decays according to the following reaction equation:[4]
- Fe2S3 + 4 HCl → 2 FeCl2 + 2 H2S + S
Greigite
Greigite, with the chemical formula Fe2+Fe3+2S4, is a mixed valence compound containing both Fe(III) and Fe(II). It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). As established by X-ray crystallography, the S anions form a cubic close-packed lattice, and the Fe cations occupy both tetrahedral and octahedral sites.[5]
References
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