It is currently believed that EBSD as a diffraction technique cannot distinguish between polar directions although Baba-Kishi showed the opposite already 20 years ago.
Which materials and applications would benefit from such differentiation?
Definitely agree!
Under kinematic diffraction conditions the difference in the intensities for -g and +g reflections must be visible due to their different structure factors. This has been shown for thin noncentrosymmetric crystals in TEM, and should work for EBSD, too.
In ZnO we have shown that triangular etch-pits point to the positive direction of the polar c-axis; EBSD though, would be a much more elegant solution, because it also shows the general orientation of the crystal grains.
Alex
Article Determination of Crystal Polarity by Electron Diffraction fr...
Article Nucleation and Growth of Basal-Plane Inversion Boundaries in ZnO
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