Submicron LaB_6 powders with high purity prepared in large scale by salt-assisted combustion synthesis  

作　　者：Zhengning Li Yujing Ou Peiqing La Yu Shi 

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology

出　　处：《Journal of Rare Earths》2018年第6期623-629,共7页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51561020)

摘　　要：LaB6 powders were synthesized in large scale by salt-assisted combustion synthesis(CS) with different NaCl diluent contents. The variety of phases, particle size and purity of the powders were investigated using X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectrometer(EDS), and transmission electron microscope(TEM). With increase of NaCl content, the adiabatic combustion temperature of the reaction system linearly declines, the average particle size of leached products decreases, the impurity phases are easier to remove, and the products purity enhances obviously. When NaCl content is 40 wt%, the purity of the superfine powders of LaBis more than 98 wt%, and the average particle size is 380 nm.LaB6 powders were synthesized in large scale by salt-assisted combustion synthesis(CS) with different NaCl diluent contents. The variety of phases, particle size and purity of the powders were investigated using X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectrometer(EDS), and transmission electron microscope(TEM). With increase of NaCl content, the adiabatic combustion temperature of the reaction system linearly declines, the average particle size of leached products decreases, the impurity phases are easier to remove, and the products purity enhances obviously. When NaCl content is 40 wt%, the purity of the superfine powders of LaB_6 is more than 98 wt%, and the average particle size is 380 nm.

关 键 词：Combustion synthesis LaB_6 powders PURITY Particle size Rare earths 

分 类 号：TB383.3[一般工业技术—材料科学与工程] TQ133.3[化学工程—无机化工]