摘要：以水合La(NO₃)₃、H₃BO₃为氧化剂，C₂H₅NO₂为还原剂，采用溶液燃烧法，在理论物质的量之比为3∶3∶5的条件下，制备正交晶系硼酸镧(α-LaBO₃)粉体，探讨不同煅烧温度和不同保温时间对产物的影响；采用X射线衍射(XRD)、扫描电镜(SEM)、荧光光谱分析等方法对制备的粉体进行表征。结果表明：合成α-LaBO₃的最佳条件为温度为750℃，煅烧4h，产物颗粒分布均匀且分散性好，晶胞参数a=0.51033nm，b=0.82508nm，c=0.58674 nm，α-LaBO₃粉体可作为基质材料应用于发光粉体的制备。

关键词：正交晶系硼酸镧；荧光基质；低温制作

Abstract: LaBO₃ powder with orthorhombic crystal system was synthesized with La( _NO3 ) ₃，H₃BO₃ and C₂H₅NO₂ at the mole ratio of 3∶3∶5 by solution combustion method．La ( NO₃ ) and H₃BO₃ were used as the oxidizing agent，and C₂H₅NO₂ was used as the reducing agent．The influence of calcination temperatures and time conditions on the product were investigated by X-ray diffraction ( XＲD) ，scanning electron microscopy ( SEM) and fluorescence．The results show that it is optimal to synthesize the LaBO₃ powder with a good particle dispersion and particle size distribution at 750 ℃ for 4 h．The values of lattice parameters are α－LaBO₃ a = 0．510 33 nm，b = 0．825 08 nm，and c = 0．586 74 nm．Thus LaBO₃ powder can be used as substrate materials in the preparation of luminescent powder．

Keywords: LaBO₃ of orthogonal system; fluorescent matrix materials; low-temperature preparation