کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5024921 1369840 2018 5 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
Study on the local structure and EPR spectroscopy of copper ions in lead borate glass
کلمات کلیدی
Lead borate glass; Electron paramagnetic resonance (EPR); Cu2+; Local structure; Spin hamiltonian parameters;
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Study on the local structure and EPR spectroscopy of copper ions in lead borate glass
چکیده انگلیسی

•The transition from B1g to B2g for CuPbB1 is determined as 12580 cm−1.•The high ionicity of CuPbB1 arises from the large content of PbO.•The relative elongation ratio is linear proportion to the ratio (gz−ge)/(gx−ge).

The anisotropic spin Hamiltonian parameters (g and A tensors) for Cu2+ in lead borate glass 10CuO·20PbO·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 λ (≈7.9%) is almost linear proportional to the experimental ratio G (=(gz − ge)/(gx − ge)) and this trend is consistent with the acquired correction for lead borate glasses 90 M2B4O7·9PbO·CuO (CuPbMB, M = Li, Na and K). The obtained d–d transition B1g → B2g (=E1 ≈ 12580 cm−1) is comparable to those for CuPbMB (E1 ≈ 13020, 12958 and 12751 cm−1 corresponding to M = Li, Na and K, respectively). The ionicity of the system is denoted by the covalency factor which is equivalent to the orbital reduction k (≈0.90) 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 (Δg1 = (gz − ge) and Δg2 = (gx − ge)) and the isotropic ones related to the orbital reduction k and the core polarization constant κ (≈0.23) which is in the range of 0.12–0.37 ascertained in previous work.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - International Journal for Light and Electron Optics - Volume 152, January 2018, Pages 16-20
نویسندگان
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