The EPR parameters D, g(parallel-to) and DELTAg (=g(parallel-to) - g(perpendicular-to)) for Ni2+ in an Al2O3 crystal have been studied by using the high-order perturbation formulas and the parameters based on the optical absorption spectrum. From the study, one can find that to reach a good fit between calculated and observed EPR parameters, the Ni2+ ion is required to move 0.05 angstrom from the exact site of the replaced Al3+ ion and to be closer to the midway plane between the oxygen layers. The reasonableness of this displacement is discussed.
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