Theoretical studies on the Spin Hamiltonian parameters and the local structure for Cu2+ in rutile

Theoretical studies on the Spin Hamiltonian parameters and the local structure for Cu2+ in rutile
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金红石中Cu2自旋哈密顿参数和局域结构的理论研究

DOI:
10.1016/j.jallcom.2020.154294
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发表时间:
2020-06
期刊:
J. Alloy Compd.
影响因子:
--
通讯作者:
Y.J. Fu
Y.J. Fu
中科院分区:
其他
文献类型:
--
作者:
H.M Zhang;Y.D. Li;B.J. Chen;C.D. Feng;Y.J. Fu

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从3d ~ 9离子在菱形拉长畸变八面体中的自旋哈密顿参数(SHP)(g因子si和超精细结构常数Ai,i=x,y,z)的微扰公式出发,对金红石(TiO_2)中Cu ~(2+)置换中心的局域结构和SHP(g因子si和Ai,i= x,y,z)进行了理论研究.相关的分子轨道系数定量确定从集群的方法在一个统一的方式,和所需的晶体场参数估计从叠加模型,使相关的晶体场参数,因此研究的SHP与本地结构的Cu 2+中心。在此基础上,计算出平行于C2轴和垂直于C2轴的Cu-O键长分别为R|| R ′ = 2.030 °,R ′ = 1.924 °,平面键角θ = 87.21°。计算结果与实验数据吻合较好,并对计算结果进行了讨论。
The spin Hamiltonian parameters (SHPs) (thegfactorsgiand the hyperfine structure constantsAi,i=x, y, z) and the local structure of the substitutional Cu2+center in rutile (TiO2) are theoretically studied from the perturbation formulas of these parameters for a 3d9ion in rhombically elongated distorted octahedra. The related molecular orbital coefficients are quantitatively determined from the cluster approach in a uniform way, and the required crystal-field parameters are estimated from the superposition model which enables correlation of the crystal-field parameters and hence the studied SHPs with the local structure of the Cu2+center. Based on the studies, the Cu–O bond lengths parallel and perpendicular to theC2-axis are found to beR||’≈ 2.030 Å andR⊥’≈ 1.924 Å, respectively, with the planar bond angleθ≈ 87.21°. The calculated SHPs are in agreement with the experimental data and the results are discussed.
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