钡锶铁氧体Ba_(0.5)Sr_(0.5)Fe_(12)O_(19)纳米粉体的制备与表征  

Preparation and Characterization of Ba_(0.5)Sr_(0.5)Fe_(12)O_(19) Hexaferrite Nano-powders

作　　者：周丽亚[1] 侯华[1] 赵宇宏[1] 李鹏慧[1] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051

出　　处：《热加工工艺》2015年第10期61-63,68,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51204147;51274175);山西省国际科技合作项目(2013081017;2012081013)

摘　　要：以溶胶-凝胶自蔓延燃烧法合成了粒径在100 nm以下的钡锶铁氧体纳米粉体,研究了p H值及柠檬酸与金属离子摩尔比(CA/M)变化对产物微观形貌及相结构的影响。用扫描电镜和X射线衍射仪进行表征。结果表明,p H变化对样品的微观结构没有影响,但是粒径随p H的增大而减小;CA/M变化对热处理后样品的相结构有显著影响。当CA/M=0.77时,产物纯度差;当CA/M≥1时经热处理得到纯Ba0.5Sr0.5Fe12O19铁氧体纳米粉体。经热处理后的粉末样品出现团聚现象。Ba0.5Sr0.5Fe12O19 powders with nanocrystalline size under 100 nm were synthesized by sol-gel auto-combustion method.The effects of p H and [citric acid]/[metallic ions]（CA/M） on the morphology and microstructure of the products were studied.The samples were characterized by SEM and XRD.The XRD results show that particle size increases with p H increasing when microstructure is not affected by p H change.Different CA/M has an obvious effects on the microstructure of annealed samples.Nanopowders with low purity can be gotten at CA/M =0.77,and pure Ba0.5Sr0.5Fe12O19 nanopowders can be obtained at CA/M≥1 after thermal treatment.The annealed samples have obvious agglomeration.

关 键 词：溶胶-凝胶自蔓延燃烧法 M-型六角铁氧体 pH 微观结构 

分 类 号：TM277[一般工业技术—材料科学与工程]