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以Ba(NO3)2Sr(NO3)2TiO(NO3)2C6H8O7.H2O为反应体系,采用溶胶低温燃烧合成法制备了Ba0.7Sr0.3TiO3超细粉末。以正交试验考察了柠檬酸与金属离子物质的量比、溶胶pH值、燃烧及热处理温度对合成粉体粒径的影响,得到的工艺参数最优组合为:n(柠檬酸)∶n(金属离子)=1.5∶1,pH=7,燃烧及热处理温度为650℃。对比了溶胶燃烧法与凝胶燃烧法对BST粉末粒度和相结构的影响。应用X射线衍射和透射电镜等对粉体的相结构、粒径、形貌进行了分析和观察。
Ba0.7Sr0.3TiO3 ultrafine powders were prepared by low temperature combustion synthesis using Ba (NO3) 2Sr (NO3) 2TiO (NO3) 2C6H8O7.H2O as the reaction system. The orthogonal experiment was carried out to investigate the effects of molar ratio of citric acid to metal ions, pH value of sol, temperature of combustion and heat treatment on the particle size of synthetic powders. The optimal process parameters were n (citric acid): n Metal ion) = 1.5: 1, pH = 7, combustion and heat treatment temperature of 650 ° C. The effects of sol-combustion method and gel-combustion method on the particle size and phase structure of BST powder were compared. The phase structure, particle size and morphology of the powders were analyzed and observed by X-ray diffraction and transmission electron microscopy.