Sign and size of b for Mn2+ and Fe3+ with O, F, or Cl as ligands are correlated with axial site distortions. Consistent values of b are obtained by application of the superposition model. These values are more than twice as large for Fe3+ than for Mn2+, but their sign may vary for different compounds and/or metal ion‐ligand pairs. Local charge compensation and effects of lattice relaxation are apparent in several cases. Unambiguous assignments of EPR spectra to specific lattice sites via these correlations are also demonstrated.
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G. Lehmann (1980) studied this question.
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