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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Defect models of the three trigonal Ti3+ centers in LiF:Ti3+ and LiF:Ti3+:Mg2+ crystals Defect models of the three trigonal Ti3+ centers in LiF:Ti3+ and LiF:Ti3+:Mg2+ crystals](/preview/png/1235938.png)
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 ã1Â 1Â 1ã 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+F3âO32â] cluster and (ii) [Ti3+F6â] cluster with the Ti3+ off-center caused by a neighboring Li+ vacancy (VLi+) at ã1Â 1Â 1ã axis. The latter seems the more likely. The defect models of centers B and C are the [Ti3+F3âO32â] clusters associated with a neighboring: Mg2+ ion at the Li+ site along ã1Â 1Â 1ã axis in the vicinity of three Fâ ions and three O2â 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 4â5, April 2007, Pages 1312-1316
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 66, Issues 4â5, April 2007, Pages 1312-1316
نویسندگان
Wen-Chen Zheng, Zhou Qing, Wen-Lin Feng, Mei Yang,