Abstract
The g factor and zero-field splitting parameter D for Cr 3+ in (NH 4) 2Co(SO 4) 2·6H 2O crystal is calculated from a high-order perturbation formula. The calculated result shows very good agreement with the observed value. It is found that Δ g due to charge-transfer (CT) mechanism is opposite in sign and about 48% in magnitude. This suggests Cr 3+ in (NH 4) 2Co(SO 4) 2 crystal has almost equal contribution of charge-field and crystal-field mechanism. So, in the study of g factor in 3d 3 ion, the contribution to CT must be taken into account.
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