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以HgI_2和KI为原料,通过溶液法合成了KHgI_3·H_2O。采用X射线单晶衍射、X射线粉末衍射、光谱测试、Kurtz-Perry粉末倍频技术、热重分析等方法对KHgI_3·H_2O的晶体结构、光学性质、热稳定性等进行研究。结果表明,KHgI_3·H_2O为正交晶系,空间群为Pna21(No.33),晶胞参数为a=0.866 08(17)nm、b=0.933 71(18)nm、c=1.1487(2)nm、α=β=γ=90°、Z=4;KHgI_3·H_2O的二阶非线性光学效应约为磷酸二氢钾(KDP)的6倍,且能实现相位匹配;KHgI_3·H_2O在中远红外波段具有较宽的透光范围,在空气中长时间放置不会潮解,是一种具有潜在应用价值的红外非线性光学材料。
Using HgI_2 and KI as raw materials, KHgI_3 · H_2O was synthesized by solution method. The crystal structure, optical properties and thermal stability of KHgI_3 · H_2O were investigated by X-ray single crystal diffraction, X-ray powder diffraction, spectral analysis, Kurtz-Perry powder frequency doubling technique and thermogravimetric analysis. The results showed that KHgI_3 · H_2O was orthorhombic and the space group was Pna21 (No.33). The unit cell parameters were a = 0.866 08 (17) nm, b = 0.93371 (18) nm and c = The second order nonlinear optical effect of KHgI_3 · H_2O is about 6 times that of potassium dihydrogen phosphate (KDP), and the phase matching can be achieved. KHgI_3 · H_2O can be used in the far-infrared The band has a wide range of light transmission, long-term placement in the air will not deliquescence, is a potential application of infrared nonlinear optical materials.