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中文摘要：
首次以LiF-H3BO3为助熔剂，用顶部籽晶法，生长出尺寸为12mm×13mm×5mm的Ba2B5O9C1透明单晶。通过热性能分析证实该晶体为非同成分熔融化合物，属于正交晶系，空间群Pnn2，晶胞参数为a=1．1576（2）nm，b=1．1619（2）nm，c=0．66874（13）nm，V=0．8994（3）nm^33，Z=4。该晶体中含有BO3和BO3基团，具有三维网状的晶体结构。Ba2B5O9Cl粉末的非线性光学效应约为KDP的3．5倍，同时还进行了红外、漫反射光谱性能的研究。
英文摘要：
Single crystals of Ba2B5OgCl with sizes up to 12 mm × 13 mm× 5 mm have been grown by top seeded solution growth method using LiF-H3BO3 as the flux for the first time. The TGA-DSC experiments proved that Ba2 B5 O9 C1 melts incongruenfly. It crystallizes in the orthorhombic system, space group Pnn2, with unit-cell parameters a = 1. 1576（2） nm,b = 1. 1619（2） nm,c =0.66874（13） nm, V =0.8994（3） nm^3,Z =4. There are BOa and BO4 groups in the Ba2B5O9CI crystal and it exhibits a three-dimensional network structure. Nonlinear optical efficiency of Ba2BsO9Cl is about 3.5 times that of KDP. The infrared spectrum and the UV-Vis diffuse reflectance spectroscopy were also performed on the reported material.
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