Superparamagnetic component in the Orgueil meteorite and Moessbauer spectroscopy studies in applied magnetic fields

Details Superparamagnetic component in the Orgueil meteorite and Moessbauer spectroscopy studies in applied magnetic fields Superparamagnetic component in the Orgueil meteorite and Moessbauer spectroscopy studies in applied magnetic fields

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..501m&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 29, 1986, p. 501-503. Research supported by the Statens Naturvidenskabelige Forskningsrad

Other

17

Electromagnetic Spectra, Iron Compounds, Meteoritic Composition, Mossbauer Effect, Orgueil Meteorite, Paramagnetism, Magnetic Field Configurations, Temperature Effects, Meteorites, Orgueil, Spectroscopy, Magnetic Fields, Paramagnetism, Iron, Carbonaceous Chondrites, Ci Chondrites, Particles, Relaxation, Magnetite, Samples, Meteorite, Spectra, Temperature

Scientific paper

Wdowiak and Agresti (1984) have recently shown that very small magnetic particles exhibiting superparamagnetic relaxation below 80 K are present in the Orgueil meteorite, a carbonaceous chondrite of group CI. They suggested that these small particles consisted of magnetite. Here, Moessbauer spectroscopy in external magnetic fields is used to show that the Orgueil meteorite does not contain superparamagnetic magnetite in any appreciable amount. The meteorite contains particles of another iron (III) compound that has a negligible net magnetization, but exhibits a superparamagnetic behavior below 65 K. These findings and those of Wdowiak and Agresti suggest that superparamagnetism is a much more common phenomenon in the universe than hitherto believed.

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