| Tetrataenite | |
|---|---|
 Silvery-bright tetrataenite crystals | |
| General | |
| Category | Native element minerals |
| Formula (repeating unit) | FeNi |
| IMA symbol | Ttae[1] |
| Strunz classification | 1.AE.10 |
| Crystal system | Tetragonal |
| Crystal class | Domatic (m) (same H-M symbol) |
| Space group | Pm |
| Unit cell | 22.92 ų |
| Identification | |
| Formula mass | 57.27 gm |
| Color | gray white, silver white |
| Crystal habit | Granular – Common texture observed in granite and other igneous rock |
| Cleavage | none |
| Fracture | malleable |
| Mohs scale hardness | 3.5 |
| Luster | metallic |
| Streak | gray |
| Diaphaneity | opaque |
| Density | 8.275 |
| Common impurities | Co, Cu, P |
| References | [2][3][4] [2] |
Tetrataenite is a native metal alloy composed of chemically-ordered L10-type FeNi, recognized as a mineral in 1980.[5] The mineral is named after its tetragonal crystal structure and its relation to the iron-nickel alloy, taenite, which is chemically disordered (A1) phase with an underlying fcc lattice.[6] Tetrataenite is one of the mineral phases found in meteoric iron.[7][3][8] Before its discovery in meteoritic samples, experimental synthesis of the L10 phase was first reported in 1962 by Louis Néel and co-workers, following neutron irradiation of a chemically disordered FeNi sample under an applied magnetic field.[9][10][11] Compared to the magnetically soft, chemically disordered A1 phase (taenite), the tetragonal L10 structure of tetrataenite leads to good hard magnetic properties, including a large uniaxial magnetocrystalline anisotropy energy.[10][12] Consequently, it is under consideration for applications as a rare-earth-free permanent magnet.[13]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Mineralienatlas – Fossilienatlas". www.mineralienatlas.de. Retrieved 1 April 2023.
- ^ a b "Tetrataenite: Mineral information, data and localities". Retrieved 1 April 2023.
- ^ "Tetrataenite". webmineral.com.
- ^ Cite error: The named reference
:12was invoked but never defined (see the help page). - ^ "Tetrataenite: Tetrataenite mineral information and data". www.mindat.org. Retrieved 2018-03-30.
- ^ "Tetrataenite". webmineral.com.
- ^ "Handbook of Mineralogy – Tetrataenite" (PDF). Retrieved 1 April 2023.
- ^ Paulevé, J.; Dautreppe, D.; Laugier, J.; Néel, L. (1962-10-01). "Une nouvelle transition ordre-désordre dans Fe-Ni (50-50 )". Journal de Physique et le Radium (in French). 23 (10): 841–843. doi:10.1051/jphysrad:019620023010084100. ISSN 0368-3842.
- ^ a b Cite error: The named reference
:5was invoked but never defined (see the help page). - ^ Cite error: The named reference
:6was invoked but never defined (see the help page). - ^ Cite error: The named reference
:7was invoked but never defined (see the help page). - ^ Lewis, L. H. (January 27, 2014). "Inspired by nature: investigating tetrataenite for permanent magnet applications". Journal of Physics: Condensed Matter. 26 (6). IOP Publishing: 064213. doi:10.1088/0953-8984/26/6/064213. PMID 24469336. S2CID 24710267.