共沉淀法制备BiFeO_3粉体  

Preparation of BiFeO_3 Powders by Co-precipitation Method

作　　者：谈国强[1] 博海洋[1] 苗鸿雁[1] 夏傲[1] 贺中亮[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《人工晶体学报》2010年第1期154-157,共4页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50672055;50872077);国家科技支撑计划(No.2006BAF02A28);陕西科技大学研究生创新基金

摘　　要：以Bi(NO3)3.5H2O和Fe(NO3)3.9H2O为原料,冰醋酸做溶剂,柠檬酸为络合剂,采用共沉淀法制备前驱物,对前驱物沉淀进行退火处理,制备出BiFeO3纳米粉体。研究了煅烧温度和冰醋酸的加入量对BiFeO3纳米粉体的晶粒尺寸及形貌的影响。采用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)对所制备的BiFeO3纳米粉体进行表征,用EDS确定了样品的表面成分组成。结果表明:退火温度为450℃时出现BiFeO3衍射峰,但存在杂相;退火温度为600℃时制备出了BiFeO3纯相粉体,粉体为立方体结构。冰醋酸加入量由1mL增大到1.8mL时,粉体的晶粒尺寸由14.21nm减小到11.65nm。通过EDS能谱分析得出BiFeO3粉体由Bi,Fe和O三种元素组成。BiFeO3 powders were prepared by co-precipitation method.The precursor was prepared by co-precipitation using Fe（NO3）3·9H2O and Bi（NO3）3·5H2O as starting materials,ice vineqar acid as solvent and citric acid as chelating agent.Then the BiFeO3 powder was obtained after annealed at a certain temperature.The powders were characterized by X-ray diffraction （XRD）,field emission scanning electron microscope （FE-SEM）.The effect of citric acid content and annealing temperature on the structure and morphology was disscussed.The results showed that grains began to grow at 450 ℃,which was made up of BiFeO3 and some other crystal phases;the pure BiFeO3 powder was acquired when the annealing temperature was 600 ℃;the particle size of the samples decreases from 14.21 nm to 11.65 nm with the adding amount of ice vineqar acid increased from 1 mL to 1.8 mL.EDS spectrum analysis proved that the powder was composed of three elements-Bi,Fe and O.

关 键 词：BiFeO3粉体 铁磁电材料 共沉淀法 

分 类 号：TB383[一般工业技术—材料科学与工程]