Iron disilicide

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| IUPACName = Iron disilicide

| OtherNames = Iron(VIII) silicide

|Section1={{Chembox Identifiers

| CASNo = 12022-99-0

| CASNo_Ref = {{cascite|correct|CAS}}

| PubChem = 6336880

| EINECS = 234-671-8

| InChI =1S/Fe.2Si

| InChIKey =JRACIMOSEUMYIP-UHFFFAOYSA-N

| SMILES =[Si]=[Fe]=[Si]

| ChemSpiderID = 4891873

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

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|Section2={{Chembox Properties

| Formula = FeSi₂

| MolarMass = 112.016 g/mol

| Appearance = gray tetragonal crystals{{cite book | editor= Haynes, William M. | date = 2016| title = CRC Handbook of Chemistry and Physics | edition = 97th | publisher = CRC Press | isbn = 9781498754293|page=4.67}}

| Density = 4.74 g/cm³

| MeltingPtC = 1220

| MeltingPt_ref =

| BoilingPt =

| Solubility =

| ElectronMobility = 1200 cm²/(V·s)

| BandGap = 0.87 eV (ind.){{cite journal|last1=Rizzi|first1=A.|last2=Rösen|first2=B. N. E.|last3=Freundt|first3=D.|last4=Dieker|first4=Ch.|last5=Lüth|first5=H.|last6=Gerthsen|first6=D.|title=Heteroepitaxy of β-FeSi₂ on Si by gas-source MBE|journal=Physical Review B|volume=51|issue=24|year=1995|pages=17780–17794|doi=10.1103/PhysRevB.51.17780|pmid=9978811|bibcode=1995PhRvB..5117780R}}

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|Section3={{Chembox Structure

| CrystalStruct = Orthorhombic{{cite journal|last1=Dusausoy|first1=Y.|last2=Protas|first2=J.|last3=Wandji|first3=R.|last4=Roques|first4=B.|title=Structure cristalline du disiliciure de fer, FeSi₂-β|journal=Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry|volume=27|issue=6|year=1971|pages=1209–1218|doi=10.1107/S0567740871003765}}

| SpaceGroup = Cmca (No. 64), oS48

| LattConst_a = 0.9863 nm

| LattConst_b = 0.7791 nm

| LattConst_c = 0.7833 nm

| UnitCellFormulas = 16

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|Section7={{Chembox Hazards

| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|315|319|335}}

| PPhrases = {{P-phrases|}}

| ExternalSDS =

| MainHazards =

| FlashPt = Non-flammable

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|Section8={{Chembox Related

| OtherAnions =

| OtherCations =Cobalt disilicide
Manganese disilicide
Titanium disilicide

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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.