کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1235938 1495287 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Defect models of the three trigonal Ti3+ centers in LiF:Ti3+ and LiF:Ti3+:Mg2+ crystals
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Defect models of the three trigonal Ti3+ centers in LiF:Ti3+ and LiF:Ti3+:Mg2+ crystals
چکیده انگلیسی
The EPR g factors of the trigonal Ti3+ center A in LiF:Ti3+ and two additional trigonal Ti3+ centers B and C in LiF:Ti3+:Mg2+ crystals are calculated from the third-order perturbation formulas based on the cluster approach. From the calculations and by considering the Ti3+ displacement along 〈1 1 1〉 axis obtained by ENDOR experiment, the defect models for the three Ti3+ centers are suggested. For center A, there are two possible models: (i) [Ti3+F3−O32−] cluster and (ii) [Ti3+F6−] cluster with the Ti3+ off-center caused by a neighboring Li+ vacancy (VLi+) at 〈1 1 1〉 axis. The latter seems the more likely. The defect models of centers B and C are the [Ti3+F3−O32−] clusters associated with a neighboring: Mg2+ ion at the Li+ site along 〈1 1 1〉 axis in the vicinity of three F− ions and three O2− ions, respectively. The reasonableness of these models is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 66, Issues 4–5, April 2007, Pages 1312-1316
نویسندگان
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