Tanzanite is noted for its remarkably strong trichroism, appearing alternately sapphire blue, violet and burgundy depending on crystal orientation.
12.
This allows for identification of the crystal orientation at the single volume of the sample from where the pattern was collected.
13.
If the sample is tilted with respect to the incident electron beam, one can obtain diffraction patterns from several crystal orientations.
14.
Thus the candidate orientation with the highest number of votes will be the most likely solution to the underlying crystal orientation present.
15.
EBSD can be used to find the crystal orientation of the material located within the incident electron beam's interaction volume.
16.
Since all possible crystal orientations are measured simultaneously, collection times can be quite short even for small and weakly scattering samples.
17.
The etch results in pits that have angled walls, with the angle being a function of the crystal orientation of the substrate.
18.
Should four bands identify the same crystal orientation then four ( four choose three ) votes will be cast for that particular solution.
19.
Thus most commercial EBSD systems utilise the indexing algorithm combined with an iterative movement of both crystal orientation and suggested pattern centre location.
20.
These maps can spatially describe the crystal orientation of the material being interrogated and can be used to examine microtexture and sample morphology.
