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:
J. Lumin.
影响因子:
--
通讯作者:
C.D. Feng
C.D. Feng
中科院分区:
其他
文献类型:
--
作者:
Y.D. Li;B.J. Chen;H.M. Zhang;C.D. Feng

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利用电子顺磁共振参数微扰公式,分别对四方压缩的八面体[VO6]8-和四方拉长的[CuO6]10−团簇进行了氧氟硼酸盐玻璃中杂质VO2+和Cu2+中心的电子顺磁共振参数的理论计算。在计算中,所需的晶场参数是由叠加模型估计的,该叠加模型使得晶场参数和EPR参数能够与[VO_6]_8-(或[CuO_6]_10)团簇的四方形变(表征为沿C_4轴的相对四方伸长(或压缩)比τ)相关联。根据计算结果,发现[VO_6]_8-和[CuO_6]_(10)−团簇在C4轴上经历了四方压缩(τ和≈分别为1.7%)和伸长(τ和≈(2.9%)),并确定了OfG中VO2+和Cu2+中心的⊥符号。上述关于局域结构性质的理论方法将有助于加深对其他含过渡金属(TM)掺杂氧化物玻璃结构性质的理解。
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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