采用燃烧合成法制备高纯超细LaB6粉末。考察反应物配比和制样压力等条件对燃烧产物相组成和微观结构的影响,利用XRD、SEM和EDS等技术对燃烧产物和浸出产物进行表征。结果表明,燃烧产物由LaB6,MgO和少量Mg3B2O6组成。随着制样压力的增加,燃烧产物变得致密坚硬。LaB6的纯度高于99.0%,其粒度为1.92?3.0μm,晶格常数a=0.4148nm。 Preparation of high purity ultrafine LaB6 powder by combustion synthesis. The effects of reaction mixture ratio and sample pressure on the phase composition and microstructure of the products were investigated. The combustion products and leaching products were characterized by XRD, SEM and EDS. The results show that the combustion products consist of LaB6, MgO and a small amount of Mg3B2O6. As the sample pressure increases, the combustion products become dense and hard. LaB6 has a purity of more than 99.0%, a particle size of 1.92-3.0 μm and a lattice constant of a = 0.4148 nm.