|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5024921||1369840||2018||5 صفحه PDF||ندارد||دانلود رایگان|
â¢The transition from B1g to B2g for CuPbB1 is determined as 12580Â cmâ1.â¢The high ionicity of CuPbB1 arises from the large content of PbO.â¢The relative elongation ratio is linear proportion to the ratio (gzâge)/(gxâge).
The anisotropic spin Hamiltonian parameters (g and A tensors) for Cu2+ in lead borate glass 10CuOÂ·20PbOÂ·70B2O3 (CuPbB1) are theoretically interpreted by the third-order perturbation formulas for 3d9 ions in tetragonally elongated octahedrons where the local distortions at Cu2+ sites are suitably involved. The local distortion characterized by the relative elongation ratio Î» (â7.9%) is almost linear proportional to the experimental ratio G (=(gzÂ âÂ ge)/(gxÂ âÂ ge)) and this trend is consistent with the acquired correction for lead borate glasses 90Â M2B4O7Â·9PbOÂ·CuO (CuPbMB, MÂ =Â Li, Na and K). The obtained dâd transition B1gÂ âÂ B2g (=E1Â âÂ 12580Â cmâ1) is comparable to those for CuPbMB (E1Â âÂ 13020, 12958 and 12751Â cmâ1 corresponding to MÂ =Â Li, Na and K, respectively). The ionicity of the system is denoted by the covalency factor which is equivalent to the orbital reduction k (â0.90) and the low covalency for CuPbB1 might be attributed to the large content PbO in the glass matrices. The sighs of hyperfine structure constants A are determined by the donations from the anisotropic g-shifts (Îg1Â =Â (gzÂ âÂ ge) and Îg2Â =Â (gxÂ âÂ ge)) and the isotropic ones related to the orbital reduction k and the core polarization constant Îº (â0.23) which is in the range of 0.12â0.37 ascertained in previous work.
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Journal: Optik - International Journal for Light and Electron Optics - Volume 152, January 2018, Pages 16-20