Iron boride

Iron boride refers to various inorganic compounds with the formula FexBy. Two main iron borides are FeB and Fe2B. Some iron borides possess useful properties such as magnetism, electrical conductivity, corrosion resistance and extreme hardness. Some iron borides have found use as hardening coatings for iron. Iron borides have properties of ceramics such as high hardness, and properties of metal properties, such as thermal conductivity and electrical conductivity. Boride coatings on iron are superior mechanical, frictional, and anti-corrosive. Iron monoboride (FeB) is a grey powder that is insoluble in water. FeB is harder than Fe2B, but is more brittle and more easily fractured upon impact.

This article is about the well defined borides of iron. For the ferroalloy, see Ferroboron.
Diiron boride
Names
IUPAC name
Iron boride
Other names
Diiron boride, Fe2B
Identifiers
3D model (JSmol)
EC Number
  • Fe2B: 234-490-4
PubChem CID
  • Fe2B: InChI=1S/B.Fe
    Key: ZDVYABSQRRRIOJ-UHFFFAOYSA-N
  • FeB: InChI=1S/B.2Fe
    Key: FSDZRQFSRALZQJ-UHFFFAOYSA-N
SMILES
  • Fe2B: [B].[Fe]
  • FeB: [B].[Fe].[Fe]
Properties
Fe2B
Molar mass 122.501 g/mol
Appearance refractory solid
Density 7.3 g/cm3
Melting point 1,389 °C (2,532 °F; 1,662 K)
insoluble
Structure
Tetragonal, tI12
Space group
 I4/mc, No. 140
a = 0.511 nm, b = 0.511 nm, c = 0.4249 nm
4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Iron boride
Names
IUPAC name
Iron boride
Other names
Iron monoboride, FeB
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • FeB: 234-489-9
  • Fe2B: 234-490-4
PubChem CID
  • FeB: InChI=1S/B.Fe
    Key: ZDVYABSQRRRIOJ-UHFFFAOYSA-N
  • Fe2B: InChI=1S/B.2Fe
    Key: FSDZRQFSRALZQJ-UHFFFAOYSA-N
SMILES
  • FeB: [B].[Fe]
  • Fe2B: [B].[Fe].[Fe]
Properties
FeB
Molar mass 66.656
Appearance grey powder
Density ~7 g/cm3
Melting point 1,658 °C (3,016 °F; 1,931 K)
insoluble
Structure
Orthorhombic, oP8
Space group
 Pnma, No. 62
a = 0.4061 nm, b = 0.5506 nm, c = 0.2952 nm
4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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