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Diffraction study demonstrates qualitative determination of crystal polarity in sphalerite structures, indicating computer-free phase analysis is viable.
Multiple electron scattering between weak beams has been used as the basis for a simple method to determine the absolute polarity of some non-centrosymmetric crystals. For crystals with the sphalerite structure many orientations have been found in which small departures from centrosymmetry produce large effects on the convergent-beam diffraction patterns (microdiffraction). The effects are reasonably independent of thickness and so can be analyzed qualitatively without the use of computers.
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Taftø et al. (1982) studied this question.
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