Theoretical study of the local distortions and the EPR parameters for VO2+ and Cu2+ centers in oxyfluoroborate glasses
Theoretical study of the local distortions and the EPR parameters for VO2+ and Cu2+ centers in oxyfluoroborate glasses
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氟硼酸盐玻璃中VO2和Cu2中心的局部畸变和EPR参数的理论研究
DOI:
10.1016/j.jlumin.2021.117973
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发表时间:
2021-02
期刊:
影响因子:
--
通讯作者:
C.D. Feng
中科院分区:
文献类型:
--
作者:
Y.D. Li;B.J. Chen;H.M. Zhang;C.D. Feng
Theoretical calculations of the local structures and the electron paramagnetic resonance (EPR) parameters for the impurities VO2+and Cu2+centers in oxyfluoroborate glasses (OFG) were performed by using the perturbation formulas of the EPR parameters for tetragonally compressed octahedral [VO6]8-and tetragonally elongated octahedral [CuO6]10−clusters, respectively. In the calculations, the required crystal-field (CF) parameters are estimated from the superposition model which enables correlation of the CF parameters and hence the EPR parameters with the tetragonal distortion (characterized by the relative tetragonal elongation (or compression) ratio τ along theC4axis) of [VO6]8-(or [CuO6]10−) cluster. Based on the calculations, the [VO6]8-and [CuO6]10−clusters are found to undergo the tetragonal compression (τ ≈ 1.7%) and elongation (τ ≈ 2.9%) along theC4axis, the signs ofA||andA⊥for VO2+and Cu2+centers in OFG were also determined. The above theoretical approach on local structural properties would enhance the understanding of the structural properties for other oxide glasses with transition-metal (TM) dopants.
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