Crystal Research and Technology
Cryst. Res. Technol. 39, 343 (2004) - Abstract -

A new method for the investigation of orientation relationships in meteoritic plessite

G. Nolze and V. Geist*

Bundesanstalt für Materialforschung und prüfung, Labor V.11, Unter den Eichen 87, 12205 Berlin, Germany
*Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Scharnhorststr. 20, 04275 Leipzig, Germany

Keywords meteorite, plessite, orientation relation, EBSD, Kurdjumov-Sachs, Nishiyama-Wassermann, Widmanstätten, microstructure, Gibeon, Agpalilik, Watson
PACS 96.50.Mt, 81.05.Bx, 61.50.Ks, 61.66.Dk, 61.62.Mn, 68.37.Hk, 68.49.Jk, 81.30.Kt, 81.30.Mh
DOI 10.1002/crat.200310193

The orientation relationship (OR) between the bcc and fcc phase in the plessite microstructure of the iron meteorites Watson, Agpalilik and Gibeon has been analysed in a scanning electron microscope using electron back-scattered diffraction (EBSD). A very strong OR exists, independently on the analysed plessite type and the observed spreading of single orientation data. The agreement between the experimental orientation distribution and existing models varies for each meteorite. The black plessite in the Agpalilik corresponds to the Nishiyama-Wassermann model whereas the duplex plessite of the Gibeon meteorite shows an OR close to the Kurdjumov-Sachs model. The Watson meteorite is strongly deformed so that a general OR is difficult to determine due to the blurred experimental orientation distribution.



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