The angular distortion around the impurity Ti3+ on the trigonal (2a) Al3+ site of LaMgAl11O19 is theoretically studied from the perturbation formulas of the anisotropic g factors, g|| and g⊥, for a 3d1 ion in trigonally distorted octahedra. Based on the studies, the metal-ligand bonding angle is found to increase from θH in the host (2a) Al3+ site to θ in the impurity center by about 2◦, due to the local tightness around the larger Ti3+ replacing the smaller Al3+. The theoretical results based on the above angular distortion are in reasonable agreement with the observed values.
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