柠檬酸自燃烧法制备BiFeO3工艺及性能研究
Study on Technique and Properties of BiFeO3 Prepared by Citrate Self-Combustion Method
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摘要: 以柠檬酸做络合剂,硝酸盐做氧化剂,采用柠檬酸-硝酸盐自燃烧法一步合成了具有扭曲菱方钙钛矿结构的BiFeO3粉体。利用X射线衍射(XRD)、差热-热重(DTA-TG)等技术分析了所得BiFeO3粉体,并研究了粉体烧结后BiFeO3陶瓷的相结构和电性能。结果表明,柠檬酸盐溶胶-凝胶法制备的前驱体具有自燃烧特性,自燃烧后BiFeO3粉体的菱方钙钛矿结构已经形成,经压片烧结后,材料的相结构更趋完善。所有样品均表现出较好的铁电性,柠檬酸盐溶胶-凝胶法制备的BiFeO3,因前驱体在反应过程中处于高度均匀分散状态,利于BiFeO3的成相,样品的剩余极化强度较大。Abstract: BiFeO3 powder with distorted rhombohedral perovskite structures were synthesized by the citrate self-combustion method using citric acid as chelating,nitrate as oxidant.XRD and DTA-TG were employed for the obtained powder.The crystal structure and physical properties of BiFeO3 powder and ceramics were investigated.The results show that precursor prepared by citrate sol-gel has self-combustion characteristics and the structure of BiFeO3 has improved after sintering.All samples show good ferroelectricity.BiFeO3 prepared by citrate sol-gel method possesses larger remanent polarization,because of the highly dispersed state of the precursor during the reaction,which will help the formation of BiFeO3.
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