Iron monosilicide
Iron monosilicide (FeSi) is an intermetallic compound, a silicide of iron that occurs in nature as the rare mineral naquite. It contains iron in both the 0 and +3 oxidation states.[4] It is a semiconductor with unusual magnetic properties at low temperatures. It has a cubic crystal lattice with no inversion center; therefore its magnetic structure is helical, with right-hand and left-handed chiralities.[3]
 Structures of left-handed and right-handed FeSi crystals (3 presentations, with different numbers of atoms per unit cell) | |
| Names | |
|---|---|
| IUPAC name
Iron silicide | |
| Other names
Naquite, fersilicite | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.506  |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| FeSi | |
| Molar mass | 83.931 g/mol |
| Appearance | gray cubic crystals[1] |
| Density | 6.1 g/cm3[1] |
| Melting point | 1,410 °C (2,570 °F; 1,680 K)[1] |
| Band gap | 0.05 eV (ind.) 0.14 eV (dir.)[2] |
| Structure | |
| Cubic[3] | |
| P213 (No. 198), cP8 | |
a = 0.44827(1) nm | |
Formula units (Z) |
4 |
| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions |
Iron germanide |
Other cations |
Cobalt silicide Manganese silicide |
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 | |
See also
References
- Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 4.68. ISBN 9781498754293.
- Galakhov, V R; Kurmaev, E Z; Cherkashenko, V M; Yarmoshenko, Yu M; Shamin, S N; Postnikov, A V; Uhlenbrock, S; Neumann, M; Lu, Z W; Klein, B M; Shi, Zhu-Pei (1995). "Electronic structure of FeSi". Journal of Physics: Condensed Matter. 7 (28): 5529–5535. arXiv:mtrl-th/9505004. doi:10.1088/0953-8984/7/28/010.
- Stishov, Sergei M.; Petrova, Alla E. (2011). "Itinerant helimagnetic compound MnSi". Uspekhi Fizicheskih Nauk. 181 (11): 1157. doi:10.3367/UFNr.0181.201111b.1157.
- Dutta, Paromita; Pandey, Sudhir K (10 April 2019). "Effects of correlations and temperature on the electronic structures and related physical properties of FeSi and CoSi: a comprehensive study". Journal of Physics: Condensed Matter. 31 (14): 145602. doi:10.1088/1361-648X/aafdce.
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