Low temperature phase transformations in the metallic phases of iron and stony-iron meteorites

Details Low temperature phase transformations in the metallic phases of iron and stony-iron meteorites Low temperature phase transformations in the metallic phases of iron and stony-iron meteorites

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..617r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, March 1988, p. 617-626.

Computer Science

14

Iron Meteorites, Low Temperature, Meteoritic Composition, Phase Transformations, Stony Meteorites, Stony-Iron Meteorites, Electron Microscopes, Iron Compounds, Kamacite, Nickel Compounds, Phase Diagrams, Meteorites, Temperature, Phases, Metals, Iron Meteorites, Structure, Stony-Iron Meteorites, Samples, Meteorite, Electron Microscopy, Aem, Kamacite, Taenite, Chemistry, Laboratory Studies, Experiments, Procedure, Photomicrographs, Catalog, Description, Models, Numerical Methods

Scientific paper

The nickel content and the structure of kamacite and decomposed taenite (clear taenite 1, CT-1; the cloudy zone, CZ; and clear taenite 2, CT-2) in the metallic phases of meteorites were determined using X-ray microanalysis techniques in the AEM. The kamacite near the CT-1 interface was found to contain about 4 wt pct Ni. The CT-1 structure contains 51.4-45.6 wt pct Ni; it is ordered FeNi with the L1(0) superstructure. The CZ structure consists of two phases: a globular phase (ordered FeNi containing 50.9 wt pct Ni) and a surrounding honeycomb martensitic phase containing 11.7 wt pct Ni. The CT-2 was found in all of the iron meteorite groups studied and in the pallasites, but not in the mesosiderites. Based on the preliminary evidence, this region is believed to be ordered Fe3Ni. Possible mechanisms for the decomposition of taenite are discussed.

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