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 | |
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IUPAC name
Iron(III) sulfide
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Other names
Iron sesquisulfide
Ferric sulfide Diiron trisulfide | |
Identifiers | |
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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).
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Infobox references
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Fe
2S
3 precipitates from solutions containing its respective ions:[2]
The resulting solid decays at a temperature over 20 °C into iron(II) sulfide (FeS) and elemental sulfur:[3]
With hydrochloric acid it decays according to the following reaction equation:[4]
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]