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Recent electron nuclear double resonance (ENDOR) experiments on Mn2+ in LiNbO3 allowed to identify the on-axis Nb neighbours together with several Li shells with one nearest neighbour Limissing, but failed to resolve the nearest off-axis Nb shell. This failure was attributed to local disorder. We discuss here that the nearby Li vacancy may be filled by a Nb which has relaxed from its normal lattice site, while Mn2+ remains on a Li site. In the case of Cr3+ in heavily Mg-codoped LiNbO3 substitution was shown to be on the Nb site. This assignement and its dependence on Mg is confirmed by a comparison of the 53Cr quadrupole and ESR data in LiNbO3 and Al2O3
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Corradi et al. (1992) studied this question.
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