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Figure 1
Σ3 twin representations: (a) a Σ3 twin is in general represented by an association of two crystals of equivalent size, but (b) a Σ3 twin results in general from a transformation during mechanical experiments or annealing treatments, and four distinct orientations (four variants) may appear after one twinning transformation (eight are represented but can be associated two by two due to the centrosymmetry of the cubes).

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ISSN: 2053-2733
Volume 63| Part 1| December 2007| Pages 11-29
doi:10.1107/S0108767306044291
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