Iron phosphide

Iron phosphide is a chemical compound of iron and phosphorus, with a formula of FeP.[2] Its physical appearance is grey, hexagonal needles.

Iron phosphide
Identifiers
3D model (JSmol)
  • InChI=1S/3Fe.H3P/h;;;1H3
  • [Fe]12[Fe]3[Fe]1P23
Properties
FeP
Molar mass 86.819 g·mol−1
Density 6.74 g/cm3
Melting point 1,100 °C (2,010 °F; 1,370 K)
Insoluble in water
Solubility soluble in nitric acid, HF, aqua regia
insoluble in dilute acid, alkalis
Structure[1]
MnP type (Orthorhombic)
Pnma (No. 62)
a = 519.1 pm, b = 309.9 pm, c = 579.2 pm
Related compounds
Other cations
 Chromium phosphide
Manganese phosphide
Cobalt phosphide
Tungsten phosphide
Ruthenium phosphide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Manufacturing of iron phosphide takes place at elevated temperatures, where the elements combine directly. Iron phosphide reacts with moisture and acids producing phosphine (PH3), a toxic and pyrophoric gas.

Iron phosphide can be used as a semiconductor. It has use in high power, high frequency applications, such as laser diodes.[3]

Below a Néel temperature of about 119 K, FeP takes on an helimagnetic structure.[4]

Hazards and mitigation

Iron phosphide is a hazardous substance.

Proper eye protection such as goggles should always be used when handling iron phosphide. It can be very harmful to the eyes, especially for individuals wearing contact lenses. Contact lenses have been known to react poorly with iron phosphide due to its corrosive properties, but the scientific world does not all agree on the use of contact lenses in association with iron phosphide.

In case of inhalation, the person should be moved to fresh air or given artificial respiration if not breathing. In case of ingestion, the person's mouth should be rinsed with water unless unconscious. In case of eye contact, immediate eye flushing is necessary.[5]

References
  1. Rundqvist, Stig; Sillén, Lars Gunnar; Timm, D.; Motzfeldt, K.; Theander, Olof; Flood, H. (1962). "Phosphides of the B31 (MnP) Structure Type". Acta Chemica Scandinavica. Danish Chemical Society. 16: 287–292. doi:10.3891/acta.chem.scand.16-0287. ISSN 0904-213X.
  2. "Iron phosphide, 99.5% (metals basis)". alfa.com. Alfa Aesar. Archived from the original on 8 April 2014. Retrieved 7 August 2018.
  3. "Iron Phosphide". americanelements.com. American Elements. Retrieved 7 August 2018.
  4. Chernyavskii, I. O.; Nikitin, S. E.; Onykiienko, Y. A.; Inosov, D. S.; Stahl, Q.; et al. (2020-08-24). "Incommensurate magnet iron monophosphide FeP: Crystal growth and characterization". Physical Review Materials. American Physical Society (APS). 4 (8): 083403. arXiv:2003.10968. Bibcode:2020PhRvM...4h3403C. doi:10.1103/physrevmaterials.4.083403. ISSN 2475-9953. S2CID 214623160.
  5. "Iron Phosphide safety data sheet". sigmaaldrich.com. Sigma Aldrich. Retrieved 7 August 2018.
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