Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..467a&link_type=abstract
Physica Scripta, vol. 17, Apr. 1978, p. 467-472. Research supported by the Natural Science Research Council of Denmark.
Physics
16
Iron Meteorites, Meteoritic Composition, Mossbauer Effect, Spectrum Analysis, Kamacite, Lamella, Meteoritic Microstructures, Nickel Alloys, Species Diffusion
Scientific paper
Moessbauer spectra have been obtained for 12 taenite lamellae from the iron meteorite Cape York. The spectra show that generally the lamellae contain three phases: a paramagnetic gamma-phase, a martensitic alpha-2 phase, and an ordered phase (superstructure) of the composition FeNi and with the structure L10. This superstructure has not previously been detected in meteorites. The ordered phase is concentrated in the outer layers of the lamellae. The outermost layer (1-2 microns) is practically pure superstructure. Moessbauer experiments show that the superstructure breaks down in about 10 hours at a temperature of 732 K. The formation of the ordered structure explains several general features of iron meteorites.
Albertsen J. F.
Aydın Meral
Knudsen Jens Martin
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