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Iron(III) sulfide

Names
IUPAC name Iron(III) sulfide
Other names Iron sesquisulfide Ferric sulfide Diiron trisulfide
Identifiers
CAS Number	12063-27-3
ChEBI	CHEBI:75899
PubChem CID	160957
UNII	003Q5FW7CS
CompTox Dashboard (EPA)	DTXSID30872530
Properties
Chemical formula	Fe2S3
Molar mass	207.90 g/mol
Appearance	yellow-green
Density	4.3 g/cm
Melting point	decomposition
Solubility in water	0.0062g/L
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). N verify (what is  ?) Infobox references

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.

Reactions

Fe
₂S
₃ precipitates from solutions containing its respective ions:

2Fe + 3S → Fe₂S₃

The resulting solid decays at a temperature over 20 °C into iron(II) sulfide (FeS) and elemental sulfur:

Fe₂S₃ → 2 FeS + S

With hydrochloric acid it decays according to the following reaction equation:

Fe₂S₃ + 4 HCl → 2 FeCl₂ + 2 H₂S + S

Greigite

Greigite, with the chemical formula FeFe₂S₄, 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.

References

1. ^ Charles D. Hodgman, Handbook of Chemistry and Physics (1961), p.590
2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1081. ISBN 978-0-08-037941-8.
3. Holleman, Wiberg (2001). Inorganic Chemistry. p. 1451. ISBN 0-12-352651-5.
4. H. Roempp, Chemie (1997), S. 1099; ISBN 3-13-734710-6
5. Vaughan, D. J.; Craig, J. R. "Mineral Chemistry of Metal Sulfides" Cambridge University Press, Cambridge: 1978. ISBN 0-521-21489-0.

• Iron(III) compounds
• Sesquisulfides
• Synthetic materials