Twinning has been studied in several samples of VO2 containing in substitution solid solution 0.5 and 2.5 at.% Cr. The twinning is by reticular pseudo-merohedry and it is controlled by the tetragonal pseudo-symmetry of a superlattice obtained from the original monoclinic cell (a ≃ 9.1, b ≃ 5.8, c ≃ 4.5 Å, β ≃ 90°) by means of the transformation 109/002/0{ 1}0. More than one twin law is found in every sample studied. All the theoretically possible twin laws, except one, have been observed. The possibility of twinning simulating a lattice and a space group different from the true ones has been pointed out and methods for detecting twins in these cases are given.
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Marezio et al. (1973) studied this question.