本文采用水热法,将两种含孤对电子的元素基团I(Ⅴ)与Bi(Ⅲ)复合到一起,合成出一种新型红外非线性光学晶体BiIO4,该晶体属正交晶系,空间群Pca21(29),晶胞参数为a=0.5645(2)nm,b=1.1036(4)nm,c=0.5731(2)nm,α=β=γ=90°。并对其进行了SEM-EDS、XRD、TG-DSC、FT-IR、UV-Vis-NIR、SHG等测试。结果表明,其二阶非线性光学效应(SHG)约为KDP的10倍,红外吸收边可以达到远红外波段(13μm)。
A new type of infrared(IR) nonlinear optical(NLO) crystal BiIO4 was synthesized by hydrothermal method through combination of two kinds of elemental group I(Ⅴ) and Bi(Ⅲ) containing lone pairs together.BiIO4 crystallizes in space group Pca21(29) of the orthorhombic system,with cell parameters a=0.5645(2) nm,b=1.1036(4) nm,c=0.5731(2) nm,α=β=γ=90°.It was characterized by the tests of SEM-EDS,XRD,TG-DSC,FT-IR,UV-Vis-NIR and second harmonic generation(SHG).The output of SHG equals to about 10 times of KDP,with IR absorption wavelength reaching far-IR range(13 μm).