Magnetic properties of tetrataenite-rich stony meteorites

Details Magnetic properties of tetrataenite-rich stony meteorites Magnetic properties of tetrataenite-rich stony meteorites

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..222n&link_type=abstract

(Symposium on Antarctic Meteorites, 7th, Tokyo, Japan, Feb. 19, 20, 1982) National Institute of Polar Research, Memoirs, Special

Computer Science

6

Meteorites, Antarctic Meteorites, Magnetic Properties, Tetrataenite, Mineralogy, Stony Meteorites

Scientific paper

Three chondrites, Yamato-74160 (LL7), ALH-77260 (L3) and St. Severin (LL6), contain considerable amount of the ordered FeNi, tetrataenite, in their metallic components. The thermomagnetic curves of these tetrataenite-rich chondrites are characterized by a very flat heating curve up to 400-450 C, and then an abrupt decrease to the Curie point, which ranges between 550-580 C. NRM of these chondrites contains a highly stable component which can be hardly demagnetized by alternating magnetic fields up to 1800 Oe peak. The highly stable component is identified to NRM of the tetrataenite phase which has a large magnetic and optical anisotropy. By heating up to 800 C, however, the tetrataenite phase is broken down by the order-disorder transformation to the ordinary disordered taenite, which has a much weaker magnetic coercivity.

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