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采用溶液燃烧法合成了钙钛矿型LaFeO3纳米粉体,系统考察了不同燃料及燃料/氧化剂的摩尔比对LaFeO3晶相组成和结构的影响。用X射线衍射仪和扫描电子显微镜对纳米粉体的晶相组成、晶粒大小及微观形貌进行了表征。实验结果表明:制备LaFeO3的适宜的燃料/氧化剂比随燃料的不同而变化,甘氨酸为燃料,在燃料/氧化剂比为化学计量比时可得到19.0 nm LaFeO3纳米晶体;柠檬酸为燃料,贫燃时(-50%)产物LaFeO3晶型最好,而乙二醇为燃料,富燃时(+40%)LaFeO3晶型最好,产物为蓬松的多孔网状纳米结构,晶粒尺寸为28.0 nm。
The perovskite-type LaFeO3 nano-powders were synthesized by the solution combustion method. The influence of the molar ratio of different fuels and fuels / oxidants on the phase composition and structure of LaFeO3 was systematically investigated. The crystal phase composition, grain size and microstructure of the nano-powders were characterized by X-ray diffraction and scanning electron microscopy. The experimental results show that the suitable ratio of fuel / oxidant to the preparation of LaFeO3 varies with the fuel and glycine is used as fuel. When the fuel / oxidant ratio is stoichiometric, 19.0 nm LaFeO3 nanocrystals can be obtained. When citric acid is used as fuel, (-50%) product LaFeO3 crystal form the best, and ethylene glycol fuel, rich in fuel (+ 40%) LaFeO3 crystal form the best, the product is fluffy porous network nanostructures, grain size of 28.0 nm.