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Abstract
AbstractAn investigation is made of EPR spectra of CaV2O6 and BaV2O6 single crystals doped with chromium. It is found that the point symmetry of the paramagnetic Cr3+ and Cr5+ ions depends on temperature. It follows from the symmetry of the Cr5+ spectrum in BaV2O6 and its superhyperfine structure at T = 77 K that the Cr5+ ion is displaced to one of two neighbouring V atoms. The observed change of the impurity ion symmetry cannot be explained both by the off‐centre ion theory and the Jahn‐Teller effect.
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