极化率
双折射
超极化率
结晶学
二次谐波产生
氧阴离子
钠长石
离子半径
金属
物理
无机化学
化学
材料科学
分子
离子
光学
有机化学
冶金
催化作用
矽卡岩
激光器
复合材料
流体包裹体
生物化学
石英
作者
Tianhui Wu,Xingxing Jiang,Yiran Zhang,Zujian Wang,Hongyuan Sha,Chao Wu,Zheshuai Lin,Zhipeng Huang,Xifa Long,Mark G. Humphrey,Chi Zhang
标识
DOI:10.1021/acs.chemmater.1c03053
摘要
Second-harmonic-generation (SHG) efficiency and birefringence are two crucial parameters for nonlinear optical (NLO) crystals. However, the simultaneous optimization of these two key parameters remains a great challenge due to their contrasting microstructure prerequisites. In this paper, the first example of tetravalent rare-earth iodate-sulfate Ce(IO3)2(SO4) (CISO) was designed by a defluorinated homovalent substitution strategy based on the parent compound CeF2(SO4)·H2O (CFSO) from the centrosymmetric to the noncentrosymmetric structure, which shows a large SHG effect of 3.5 × KDP in metal sulfates and a significant birefringence (0.259 at 546 nm) in hetero-oxyanion tetrahedral-group-based optical crystals. In the structure of CISO, both [IO3] and [SO4] groups are in the cis-position to each other, while [CeO8] polyhedra are highly distorted due to the different coordination environments of two kinds of oxyanions in one structure, which displays optimized optical anisotropy and polarizability attributed to their synergistic effect, leading to the strong SHG efficiency and sufficient birefringence. First-principles simulations for CISO have been employed to rationalize the correlations between the molecular structure and optical properties.
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