Inspired by nature: investigating tetrataenite for permanent magnet applications.
J Phys Condens Matter
; 26(6): 064213, 2014 Feb 12.
Article
en En
| MEDLINE
| ID: mdl-24469336
ABSTRACT
Chemically ordered L10-type FeNi, also known as tetrataenite, is under investigation as a rare-earth-free advanced permanent magnet. Correlations between crystal structure, microstructure and magnetic properties of naturally occurring tetrataenite with a slightly Fe-rich composition (~ Fe55Ni44) obtained from the meteorite NWA 6259 are reported and augmented with computationally derived results. The tetrataenite microstructure exhibits three mutually orthogonal crystallographic variants of the L10 structure that reduce its remanence; nonetheless, even in its highly unoptimized state tetrataenite provides a room-temperature coercivity of 95.5 kA m(-1) (1200 Oe), a Curie temperature of at least 830 K and a largely temperature-independent anisotropy that preliminarily point to a theoretical magnetic energy product exceeding (BH)max = 335 kJ m(-3) (42 MG Oe) and approaching those found in today's best rare-earth-based magnets.
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Banco de datos:
MEDLINE
Asunto principal:
Productos Biológicos
/
Meteoroides
/
Imanes
/
Metales
Tipo de estudio:
Prognostic_studies
Idioma:
En
Año:
2014
Tipo del documento:
Article