ESR, optical absorption, IR and Raman studies of xTeO₂ + (70 鈭?#xa0;x)B₂O₃ + 5TiO₂ + 24R₂O:1CuO (x = 10, 35 and 60 mol%; R = Li, Na and K)

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• 作者：S. Suresh^a ; ^{sripada_suresh2020@rediffmail.com} ; P. Gayathri Pavani^b ; V. Chandra Mouli^b
• 关键词：C. Infrared spectroscopy ; C. Raman spectroscopy ; B. EPR
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：March, 2012
• 卷：47
• 期：3
• 页码：724-731
• 文件大小：822 K

摘要

xTeO₂ + (70 鈭?#xA0;x)B₂O₃ + 5TiO₂ + 24R₂O:1CuO (x = 10, 35 and 60; R = Li, Na and K) glass system were studied by spectroscopic techniques such as ESR, optical absorption, Raman and IR. From ESR spectra, the spin Hamiltonian parameter values indicate that the ground state of Cu²⁺ is and the site symmetry around the Cu²⁺ ion is tetragonally distorted octahedral coordination. Bonding parameters calculated from optical absorption and ESR data are found to change with alkali oxide and TeO₂ content. Bonding parameters indicate a slight covalency for the in-plane 蟽 bonding as compared to in-plane and out-of-plane 蟺 bonds. Both Raman and IR results show that glass network consists of TeO₃, TeO₄, BO₃, BO₄ and RiO₄ group as basic structural groups. BO₃-BO₄^{鈭?/sup> ring structure interconnected by TeO₃鈭?/sup> and TeO₄鈭?/sup> groups, where the BO₄鈭?/sup> groups are neighbors of the TeO₃鈭?/sup> groups. BO₃ 鈫?#xA0;BO₄ transition is also observed, which correlates with the transition of TeO₄ 鈫?#xA0;TeO₃ via TeO₃₊₁.}