Local defect structures and EPR studies on (FeO6)9- and (FeO4)5- clusters in YGG: Fe3+ system
Authors: Li, Hui-Li1; Kuang, Xiao-Yu2; Li, Ying1; Duan, Mei-Ling1
Source: Molecular Physics, Volume 106, Numbers 21-23, November 2008 , pp. 2643-2648(6)
Publisher: Taylor and Francis Ltd
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Abstract:
The octahedral (FeO6)9- and tetrahedral (FeO4)5- clusters in yttrium gallium garnet (YGG): Fe3+ system are investigated based on the 252 × 252 complete energy matrices for d5 configuration ions in trigonal and tetragonal ligand fields, moreover, the EPR and optical spectra are made unified calculation. The results indicate that the defect structures around Fe3+ centres display expansion effects at different temperatures 4.2 and 295 K, and which are close to those in YIG garnet, respectively. Simultaneously, the defect structure parameters for Fe3+ centres in YGG are determined, and the relationship between the defect structure and the temperature has been discussed.Keywords: EPR; local defect structure; Fe3+ centres
Document Type: Research article
DOI: 10.1080/00268970802629486
Affiliations: 1: Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, China; 2: Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, China;,International Centre for Materials Physics, Academia Sinica, Shenyang, China
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