By using the spin-orbit coupling mechanism and the superposition model, the local environment of the Fe3+ ion in Al2O3 crystal is studied from its EPR data. From the studies, it is found that the Fe3+ ion does not occupy the exact Al3+ site, but, due to its larger size than the replaced host ion, it is forced to move towards the bigger oxygen triangle. It appears that the displacement direction of impurity ion in corundum-type structure depends not only upon the charge of impurity, but also upon its size. (C) 1998 Elsevier Science B.V. All rights reserved.
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sichuan univ, dept mat sci, chengdu 610064, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;zheng, wc (reprint author), sichuan univ, dept mat sci, chengdu 610064, peoples r china;sichua@rose.cnc.ac.cn
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