Iron disilicide

Iron disilicide
Names
	IUPAC name Iron disilicide
	Other names Iron(VIII) silicide
Identifiers
CAS Number	12022-99-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	4891873 ;
ECHA InfoCard	100.031.507
EC Number	234-671-8;
PubChem CID	6336880;
CompTox Dashboard (EPA)	DTXSID00892427 ;
	InChI InChI=1S/Fe.2Si Key: JRACIMOSEUMYIP-UHFFFAOYSA-N;
	SMILES [Si]=[Fe]=[Si];
Properties
Chemical formula	FeSi2
Molar mass	112.016 g/mol
Appearance	gray tetragonal crystals
Density	4.74 g/cm3
Melting point	1,220 °C (2,230 °F; 1,490 K)
Band gap	0.87 eV (ind.)
Electron mobility	1200 cm2/(V·s)
Structure
Crystal structure	Orthorhombic
Space group	Cmca (No. 64), oS48
Lattice constant	a = 0.9863 nm, b = 0.7791 nm, c = 0.7833 nm
Formula units (Z)	16
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Flash point	Non-flammable
Related compounds
Other cations	Cobalt disilicide; Manganese disilicide; Titanium disilicide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). (what is ?) Infobox references

Iron disilicide (FeSi₂) is an intermetallic compound, a silicide of iron that occurs in nature as the rare mineral linzhiite. At room temperature it forms orthorhombic crystals (β phase), which convert into a tetragonal α phase upon heating to 970 °C.