A transmission electron microscopic study of the Bethany iron meteorite

Details A transmission electron microscopic study of the Bethany iron meteorite A transmission electron microscopic study of the Bethany iron meteorite

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jmats..20..590h&link_type=abstract

Journal of Materials Science (ISSN 0022-2461), vol. 20, Feb. 1985, p. 590-596.

Physics

Condensed Matter

Materials Science

2

Electron Microscopy, Iron Meteorites, Meteoritic Microstructures, Electron Diffraction, Iron, Martensite, Nickel, Widmanstatten Structure, Meteorites, Microscopy, Iron Meteorites, Bethany, Samples, Meteorite, Tem, Gibeon, Iva Irons, Octahedrite, Optical Properties, Particles, Crystallography, Kamacite, Taenite, Parent Material, Plessite, Stem, Electron Diffraction, Photomicrographs

Scientific paper

The Bethany iron meteorite, which is a part of the Gibeon shower, is a fine octahedrite with zoned plessite fields of various sizes. The optically irresolvable microstructural details inside the plessitic fields have been studied by transmission electron microscopy, and the crystallographic relationships between the primary kamacite (alpha) and the parent taenite (gamma), and between the alpha and gamma particles in the coarse plessite, have been examined using electron diffraction. In the case of primary kamacite, the orientation-relationship with gamma was close to the Nishiyama-Wasserman relationship, whereas, for the plessitic alpha, the orientation-relationship with gamma was close to Kurdjumov-Sachs. It was also found that the (111)-gamma and (110)-alpha planes were not strictly parallel. Additionally, measurements of the composition profile through the zoned plessite have been made using STEM microanalysis technique, and related to microstructure.

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