The existence of antitaenite as a new mineral species, occurring in both iron meteorites and in chondrites, was first proposed in 1995[1] but the IMA has not approved paramagnetic antitaenite; instead the organization regards it as a variety of taenite. Gamma (fcc) Fe-Ni alloys with low-Ni (about 25% Ni) are probably inhomogeneous on a nanometer scale.[2]
Antitaenite and taenite have the same crystal structure (face centered cubic) and can have the same chemical composition (same proportions of Fe and Ni) but they differ in their electronic structures: taenite has a high magnetic moment whereas antitaenite has a low magnetic moment. This difference in electronic structure was first established in 1999[3] and arises from a high-magnetic-moment to low-magnetic-moment transition occurring in the Fe-Ni bi-metallic alloy series.[4] The same electronic structure transition is believed to be a causal factor in Invar behaviour.
^D.G. Rancourt and R.B. Scorzelli. Low Spin γ-Fe-Ni (γLS) Proposed as a New Mineral in Fe-Ni-Bearing Meteorites: Epitaxial Intergrowth of γLS and Tetrataenite as Possible Equilibrium State at ~20-40 at % Ni. Journal of Magnetism and Magnetic Materials 150 (1995) 30-36
^Yassir Ahmed Mohamed Abdu (2004). Mössbauer Spectroscopy of Meteoritic and Synthetic Fe-Ni Alloys (Thesis). University of Uppsala. Retrieved 4 December 2012.
^D.G. Rancourt, K. Lagarec, A. Densmore, R.A. Dunlap, J.I. Goldstein, R.J. Reisener, and R.B. Scorzelli. Experimental Proof of the Distinct Electronic Structure of a New Meteoritic Fe-Ni Alloy Phase. Journal of Magnetism and Magnetic Materials 191 (1999) L255-L260
^K. Lagarec, D.G. Rancourt, S.K. Bose, B. Sanyal, and R.A. Dunlap. Observation of a composition-controlled high-moment/low-moment transition in the face centered cubic Fe-Ni system: Invar effect is an expansion, not a contraction. Journal of Magnetism and Magnetic Materials 236 (2001) 107-130.
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antitaenite, meteoritic, metal, alloy, mineral, composed, iron, nickel, traces, other, elements, that, face, centered, cubic, crystal, structure, there, three, known, meteoritic, minerals, kamacite, taenite, tetrataenite, existence, antitaenite, mineral, speci. Antitaenite is a meteoritic metal alloy mineral composed of iron Fe and 20 40 nickel Ni and traces of other elements that has a face centered cubic crystal structure There are three known Fe Ni meteoritic minerals kamacite taenite and tetrataenite The existence of antitaenite as a new mineral species occurring in both iron meteorites and in chondrites was first proposed in 1995 1 but the IMA has not approved paramagnetic antitaenite instead the organization regards it as a variety of taenite Gamma fcc Fe Ni alloys with low Ni about 25 Ni are probably inhomogeneous on a nanometer scale 2 Antitaenite and taenite have the same crystal structure face centered cubic and can have the same chemical composition same proportions of Fe and Ni but they differ in their electronic structures taenite has a high magnetic moment whereas antitaenite has a low magnetic moment This difference in electronic structure was first established in 1999 3 and arises from a high magnetic moment to low magnetic moment transition occurring in the Fe Ni bi metallic alloy series 4 The same electronic structure transition is believed to be a causal factor in Invar behaviour See also editGlossary of meteoriticsReferences edit D G Rancourt and R B Scorzelli Low Spin g Fe Ni gLS Proposed as a New Mineral in Fe Ni Bearing Meteorites Epitaxial Intergrowth of gLS and Tetrataenite as Possible Equilibrium State at 20 40 at Ni Journal of Magnetism and Magnetic Materials 150 1995 30 36 Yassir Ahmed Mohamed Abdu 2004 Mossbauer Spectroscopy of Meteoritic and Synthetic Fe Ni Alloys Thesis University of Uppsala Retrieved 4 December 2012 D G Rancourt K Lagarec A Densmore R A Dunlap J I Goldstein R J Reisener and R B Scorzelli Experimental Proof of the Distinct Electronic Structure of a New Meteoritic Fe Ni Alloy Phase Journal of Magnetism and Magnetic Materials 191 1999 L255 L260 K Lagarec D G Rancourt S K Bose B Sanyal and R A Dunlap Observation of a composition controlled high moment low moment transition in the face centered cubic Fe Ni system Invar effect is an expansion not a contraction Journal of Magnetism and Magnetic Materials 236 2001 107 130 External links editMindat with location data Webmineral data nbsp This article about a specific mineral or mineraloid is a stub You can help Wikipedia by expanding it vte nbsp This alloy related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Antitaenite amp oldid 1013063382, wikipedia, wiki, book, books, library,
