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Studies of the Angular Distortion around Ti

3+

on the Trigonal (2a) Al

3+

Site of LaMgAl

11

O

19

Hui-Ning Dongaand Wei-Dong Chenb

aInstitute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China

bInstitute of Solid State Physics, Sichuan Normal University, Chengdu 610066, P. R. China Reprint requests to Dr. H.-N. D.; E-mail:donghn@cqupt.edu.cn

Z. Naturforsch. 61a, 83 – 86 (2006); received July 1, 2005

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, gand g⊥, for a 3d1ion in trigonally distorted octahedra. Based on the studies, the metal-ligand bonding angle is found to increase fromθHin the host (2a) Al3+site toθin 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.

Key words: Defect Structure; Gyromagnetic Factors; Crystal- and Ligand-Field Theory; Ti3+; LaMgAl11O19.

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