Orientation Distribution Within a Single Hematite Crystal |
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| Authors: | Ralf Hielscher Helmut Schaeben Heinrich Siemes |
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| Institution: | 1.Applied Functional Analysis,TU,Chemnitz,Germany;2.Geoscience Mathematics and Informatics,TU Bergakademie,Freiberg,Germany;3.RWTH,Aachen,Germany |
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| Abstract: | While crystallography conventionally presumes that a single crystal carries a unique crystallographic orientation, modern
experimental techniques reveal that a single crystal may exhibit an orientation distribution. However, this distribution is
largely concentrated; it is extremely concentrated when compared with orientation distributions of polycrystalline specimen.
A case study of a deformation experiment with a single hematite crystal is presented, where the experimental deformation induced
twining, which in turn changed a largely concentrated unimodal “parent” orientation distribution into a multimodal orientation
distribution with a major mode resembling the parent mode and three minor modes corresponding to the progressive twining.
The free and open source software MTEX for texture analysis was used to compute and visualize orientations density functions
from both integral orientation measurements, i.e. neutron diffraction pole intensity data, and individual orientation measurements,
i.e. electron back scatter diffraction data. Thus it is exemplified that MTEX is capable of analysing orientation data from
largely concentrated orientation distributions. |
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