尿素掺杂对ZTS单晶中SHG效率的提高及其与晶体完整性的关系（库尔茨粉末和高分辨X射线衍射法）
Enhancement of SHG efficiency by urea doping in ZTS single crystals and its correlation with crystalline perfection revealed by Kurtz powder and high-resolution X-ray diffraction methods
摘要：
研究了尿素掺杂对三硫脲硫酸锌（ZTS）单晶二次谐波产生效率的提高以及晶体完整性与二次谐波产生效率的关系。ZTS是一种很有潜力的半有机非线性光学材料。采用缓慢蒸发溶液法（SEST）成功地生长了纯ZTS和掺尿素ZTS单晶。通过傅里叶变换红外光谱仪（FTIR）对掺杂剂的存在进行了确认和分析。采用高分辨X射线衍射仪（HRXRD）研究了不同浓度尿素掺杂对晶体完整性的影响。HRXRD研究表明，该晶体可以容纳尿素在ZTS达到一定的临界浓度，而没有任何恶化的结晶完整性。高于该浓度，形成非常低角度的结构晶界，并且似乎高于临界浓度的过量尿素沿着晶界偏析。在非常高的掺杂浓度下，发现晶体含有镶嵌块。用库尔兹粉末技术研究了倍频效率。晶体的相对倍频效率随尿素浓度的增加而显著提高。讨论了晶体完整性与倍频效率之间的相关性。
英文摘要：
Enhancement of second harmonic generation (SHG) efficiency and the correlation between crystalline perfection and SHG with urea doping on tristhioureazinc(II) sulphate (ZTS) single crystals have been investigated. ZTS is a potential semiorganic nonlinear optical (NLO) material. Pure and urea doped single crystals of ZTS have been successfully grown by slow evaporation solution technique (SEST). Presence of dopants has been confirmed and analyzed by Fourier transform infrared (FTIR) spectrometer. The influence of urea doping at different concentrations on the crystalline perfection has been thoroughly assessed by high resolution X-ray diffractometry (HRXRD). HRXRD studies revealed that the crystals could accomodate urea in ZTS up to some critical concentration without any deterioration in the crystalline perfection. Above this concentration, very low angle structural grain boundaries were developed and it seems, the excess urea above the critical concentration was segregated along the grain boundaries. At very high doping concentrations, the crystals were found to contain mosaic blocks. The SHG effeiciency has been studied by using Kurtz powder technique. The relative SHG efficiency of the crystals was found to be increased substantially with the increase of urea concentration. The correlation found between the crystalline perfection and SHG efficiency was discussed.
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