Electron-optical observations of ordered FeNi in the Estherville meteorite

Details Electron-optical observations of ordered FeNi in the Estherville meteorite Electron-optical observations of ordered FeNi in the Estherville meteorite

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..151m&link_type=abstract

Nature, vol. 284, Mar. 13, 1980, p. 151-153.

Physics

Optics

7

Electron Microscopy, Intermetallics, Meteoritic Composition, Optical Reflection, Anisotropic Media, Electron Optics, Face Centered Cubic Lattices, Iron Compounds, Nickel Compounds, Polarized Light, Solid Phases, Meteorites, Estherville Meteorite, Iron/Nickel, Observations, Optical Properties, Taenite, Structure, Matrix, Element Ratios, Anisotropy, X-Ray Diffraction, Mossbauer Spectrum, Irradiation, Techniques, Phases, Electron Microscopy, Electron Probe Microanalysis, Diffraction Pattern, Electrons, Photogr

Scientific paper

Electron optical studies of the ordered FeNi (taenite) phase in the Estherville meteorite are reported. A thin section of the meteorite containing a large area of continuous anisotropic taenite was studied by crossed polar reflected light microscopy, and electron probe microanalysis, transmission electron microscopy, scanning transmission electron microscopy and X-ray energy dispersive spectrometry. Results reveal the presence of preferentially ion-etched regions of clear taenite corresponding to single crystals, with superlattice reflections in the fundamental FeNi reciprocal lattice arising from long-range ordering. The presence of antiphase domain boundaries within the regions also confirms the presence of ordering. It is thus proposed that clear taenite in the Estherville meteorite contains regions of ordered FeNi phase in a disordered gamma-phase matrix.

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