Physics – Optics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990metic..25..167z&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 25, Sept. 1990, p. 167-175.
Physics
Optics
3
Iron Meteorites, Meteoritic Composition, Meteoritic Microstructures, Electron Microscopy, Electron Optics, Honeycomb Structures, Phase Transformations
Scientific paper
A characterization of the microstructural features of Santa Catharina (SC) from the millimeter to submicron scale is presented. The same specimen was examined using an optical microscope, a scanning electron microscope, an electron probe microanalyzer, and an analytical electron microscope. Findings include the fact that SC metal nodules may have different bulk Ni values, leading to different microstructures upon cooling; that SC USNM 6293 is the less corroded sample, as tetrataenite exists as less than 10 nm ordered domains throughout the entire fcc matrix (it is noted that this structure is the same as that of the Twin City meteorite and identical to clear taenite II in the retained taenite regions of the octahedrites); that SC USNM 3043 has a more complicated microstructure due to corrosion; and that the low Ni phase of the cloudy zone was selectively corroded in some areas and formed the dark regions, indicating that the SC meteorite corrosion process was electrochemical in nature and may involve Cl-containing akaganeite.
Clarke Roy S. Jr.
Goldstein Joseph I.
Williams Brian D.
Zhang James J.
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