User:Jkgarland/sandbox
| Tetrataenite | |
|---|---|
 Silvery-bright tetrataenite crystals | |
| General | |
| Category | Native element minerals |
| Formula (repeating unit) | FeNi |
| Strunz classification | 1.AE.10 |
| Crystal system | Monoclinic |
| 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 | [1][2][3] [2] |
Tetrataenite[edit]
Tetrataenite is a native metal composed of chemically-ordered L10-type FeNi, recognized as a mineral in 1980.[4][5] The mineral is named after its tetragonal crystal structure and its relation to the iron-nickel alloy, taenite.[6] It is one of the mineral phases found in meteoric iron.[7][8][9]
Formation[edit]
Meteorites[edit]
Tetrataenite forms naturally in slow-cooled iron meteorites that contain taenite[10]. It is found most abundantly in slow-cooled chondrite meteorites (below 350 °C)[11], as well as in mesosiderites.[10] At high (as much as 52%) Ni content and temperatures below 300 °C, tetrataenite is broken down from taenite in meteorites.[12] The tetragonal L10 structure forms through a disorder-order transformation from the A1 face centered cubic (fcc) crystal structure of FeNi.[4]
Terrestrial Synthesization[edit]
Thin films of FeNi alloys have been created with sputter deposition followed by annealing and confirmed to be L10 structure.
Crystal Structure[edit]
Tetrataenite has a highly ordered crystal structure,[12] appearing creamy in color and displaying optical anisotropy[10]. FeNi easily forms into a cubic crystal structure, but does not have magnetic anisotropy in this form. Three variants of the L10 tetragonal crystal structure have been found, as chemical ordering can occur along any of the three axes.[4]
Magnetic Properties[edit]
Tetrataenite displays permanent magnetization, in particular, high coercivity[5]. It has a theoretical magnetic energy product, the maximum amount of magnetic energy stored, over 335 kJ m-3.[5]
Applications[edit]
Tetrataenite is a candidate for replacing rare-earth magnets such as samarium and neodymium since both iron and nickel are earth-abundant and inexpensive.[4][5]
See also[edit]
References[edit]
- ^ Mineralienatlas
- ^ Cite error: The named reference
Mindatwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Webminwas invoked but never defined (see the help page). - ^ a b c d Lewis, L. H. (January 27, 2014). "Inspired by nature: investigating tetrataenite for permanent magnet applications". Journal of Physics: Condensed Matter. 26. IOP Publishing – via IOPscience.
- ^ a b c d Dos Santos, E. (6 September 2014). "Kinetics of tetrataenite disordering" (PDF). Journal of Magnetism and Magnetic Materials. 375: 234–241 – via ScienceDirect.
- ^ "Tetrataenite: Tetrataenite mineral information and data". www.mindat.org. Retrieved 2018-03-30.
- ^ "Tetrataenite". webmineral.com.
- ^ Mindat.org – Tetrataenite
- ^ Handbook of Mineralogy – Tetrataenite
- ^ a b c Clarke, Roy S.; Scott, Edward R. D. (March 6, 1980). "Tetrataenite - ordered FeNi, a new mineral in meteorites" (PDF). American Mineralogist. 65: 624–630.
- ^ Barthelmy, Dave. "Tetrataenite Mineral Data". webmineral.com. Retrieved 2018-04-10.
- ^ a b "Taenite." Britannica Academic, Encyclopædia Britannica, 6 Nov. 2009. academic-eb-com.ezproxy.neu.edu/levels/collegiate/article/taenite/342903. Accessed 30 Mar. 2018.
 | This is a user sandbox of Jkgarland. You can use it for testing or practicing edits. This is not the sandbox where you should draft your assigned article for a dashboard.wikiedu.org course. To find the right sandbox for your assignment, visit your Dashboard course page and follow the Sandbox Draft link for your assigned article in the My Articles section. |