中文摘要：

利用高温固相反应法合成出Pb2[B5O9]Br硼酸盐粉末。采用PbO—NaF做复合助熔剂，利用顶部籽晶法获得了3mm×3mm×1．5mm的透明单晶，X射线粉末衍射数据显示，该晶体属正交晶系，Pnn2空间群，晶胞参数为a=1．1524（1）nm，b=1．1431（1）nm，c=0．65399（3）nm。红外光谱测量证实晶体结构中含有BO3^3-和BO4^5-基团。反射光谱表明Pb2[B5O9]Br的紫外吸收边在250nm左右。Pb2[B5O9]Br粉末倍频效应（SHG）测试表明该化合物具有非线性光学效应，信号强度约等同于β-BaB2O4。

英文摘要：

Pb2[B5O9]Br borate powder was synthesized by the high-temperature solid-state method. The transparent single crystal of Pb2[B5O9]Br was grown by top-seeded solution growth method using the powder as raw material. The typical crystal size was about 3mm×3mm×1.5mm. X-ray diffraction analysis show that it is same as the one reported in the literature. It belongs to the orthorhombic system, space group Pnn2, and lattice parameters a = 1. 1524 （1） nm, b = 1. 1431 （1） nm, c = 0. 65399 （3） nm. The measurement of the infrared spectrum indicate that the basic anionic group is the BO33- and BO45-. The reflection spectrum show that the cut-off wavelength of Pb2[B5O9]Bris about 250 nm. Pb2[B5O9]Br exhibits a powder second harmonic generation （SHG） effect similar to that of β-BaB2O4.