柠檬酸自燃烧法制备BiFeO_3工艺及性能研究  

Study on Technique and Properties of BiFeO_3 Prepared by Citrate Self-Combustion Method

作　　者：王春梅[1] 刘世江[2] 郝俊红[1] 李涛[1] 赵猛[1] 陈镇平[1] 

机构地区：[1]郑州轻工业学院技术物理系,郑州450002 [2]洛阳师范学院物理与电子信息学院,洛阳471022

出　　处：《功能材料与器件学报》2011年第4期345-349,共5页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(10875107);河南省自然科学基金(082300440080)资助项目

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。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.

关 键 词：柠檬酸盐自燃烧法 BiFeO3陶瓷 铁电性能 介电性能 

分 类 号：TB32[一般工业技术—材料科学与工程]