Iron boride

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
  • Fe2B: InChI=1S/B.Fe
    Key: ZDVYABSQRRRIOJ-UHFFFAOYSA-N
  • FeB: InChI=1S/B.2Fe
    Key: FSDZRQFSRALZQJ-UHFFFAOYSA-N
  • Fe2B: [B].[Fe].[Fe]
  • FeB: [B]#[Fe]
Properties
Fe2B
Molar mass 122.501 g/mol[1]
Appearance refractory solid
Density 7.3 g/cm3[1]
Melting point 1,389 °C (2,532 °F; 1,662 K)[1]
insoluble
Structure[2]
Tetragonal, tI12
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).
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
  • FeB: InChI=1S/B.Fe
    Key: ZDVYABSQRRRIOJ-UHFFFAOYSA-N
  • Fe2B: InChI=1S/B.2Fe
    Key: FSDZRQFSRALZQJ-UHFFFAOYSA-N
  • FeB: [B].[Fe]
  • Fe2B: [B].[Fe].[Fe]
Properties
FeB
Molar mass 66.656[1]
Appearance grey powder
Density ~7 g/cm3[1]
Melting point 1,658 °C (3,016 °F; 1,931 K)[1]
insoluble
Structure[3]
Orthorhombic, oP8
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).

Iron boride refers to various inorganic compounds with the formula FexBy.[4] 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.[5] 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.

  1. ^ a b c d e f Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.68. ISBN 978-1439855119.
  2. ^ Gianoglio, C.; Badini, C. (1986). "Distribution equilibria of iron and nickel in two phase fields of the Fe-Ni-B system". Journal of Materials Science. 21 (12): 4331–4334. Bibcode:1986JMatS..21.4331G. doi:10.1007/BF01106551. S2CID 97916863.
  3. ^ Lyakhova, M.B.; Pastushenkov, Y. G.; Zhdanova, O.V. (2013). "Magnetic Properties and Domain Structure of FeB Single Crystals". Metal Science and Heat Treatment. 55 (1–2): 68–72. Bibcode:2013MSHT...55...68Z. doi:10.1007/s11041-013-9581-0. S2CID 136585232.
  4. ^ Haynes, William M. Handbook of Chemistry and Physics (91 edition.). 2010, Boca Raton, Florida: CRC Press. ISBN 978-1439820773
  5. ^ "Boriding / Boronizing (DHB)". IBC Coating Technologies. Retrieved 17 November 2014.