Mathematics – Logic
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..590b&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 28, no. 4, p. 590-595.
Mathematics
Logic
5
Carbonaceous Chondrites, Chemical Composition, Meteoritic Microstructures, Titanium Oxides, Ureilites, Grain Size, Interstellar Chemistry, Interstellar Matter
Scientific paper
Rare, ultrafine-grained Ti oxides (Ti3O5 and the Magneli phases, Ti5O9 and Ti8O15) have been identified by TEM in the CM2 carbonaceous chondrite, Bells, and a carbonaceous chondrite matrix clast from the Nilpena polymict ureilite. In both meteorites the Ti oxides occur in the matrix as isolated grains and clusters of two or more grains. They are euhedral in shape and have grain sizes of 0.05-0.3 micron. Magneli phases have been recently shown to be a common component in some interplanetary dust particles, but this is the first reported occurrence in a meteorite. The morphological properties and grain size of the Ti oxides are consistent with formation by vapor phase condensation either within the solar nebula or possibly in a presolar environment.
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