کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5447301 | 1511495 | 2017 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Local distortion and EPR parameters of copper(II) in borate glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The EPR parameters (g and A tensors) of the paramagnetic Cu2+ sites in CaB4O7, LiCaBO3, Li2B4O7, KLiB4O7 glasses are well explained by utilizing the fourthâorder perturbation formulas for 3 d9 ions in the tetragonally elongated octahedral [CuO6]10â clusters. The magnitude of the local distortion for the [CuO6]10â clusters suffering the Jahn-Teller effect is denoted by the relative elongation ratio Ï which is proportional to the ratio Îg///Îg⥠(Îg//= g//-gs and Îgâ¥Â = gâ¥-gs). The g isotropies giso (=(g//+2gâ¥)/3) undergo an linear increase with the decline of the covalecny of the glass systems (i.e., the augment of the orbital reduction factor k). The signs of the hyperfine structure constants are determined by computing the quantitative contributions arising from the isotropic and anisotropic copper 3d-3s (4s) orbital admixtures indicated by the core polarization constant κ and the reduction factor H, respectively. The above correlations are proved to be available for analogous borate glasses doping with copper ions, e.g., MRbB4O7 (M = Li, Na and K), 90M2B4O7·9PbO·CuO (M = Li, Na and K), 10MO·30ZnO·60B2O3 (M = Mg, Ca and Sr) and xLi2O·(30-x)Na2O·69.5B2O3 (5 â¤Â x â¤Â 25 mol%), and all the results are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 111, December 2017, Pages 41-46
Journal: Journal of Physics and Chemistry of Solids - Volume 111, December 2017, Pages 41-46
نویسندگان
Min-Quan Kuang, Li-Dan Wang, Shu-Kai Duan,