用溶胶-凝胶法制备纳米锶铁氧体粉  

Nano-sized powders of SrFe_(12)O_(19) synthesized by the sol-gel method

作　　者：黄英[1] 杜朝锋[1] 秦秀兰[1] 何文栋[1] 

机构地区：[1]西北工业大学理学院应用化学系,西安710072

出　　处：《材料研究学报》2007年第3期324-328,共5页Chinese Journal of Materials Research

基　　金：航天支撑技术基金项目N5CH0001;西北工业大学研究生创业种子基金项目M016663资助项目.~~

摘　　要：以硝酸锶和硝酸铁无机盐为前驱体配制非化学计量比溶胶,采用柠檬酸溶胶-凝胶法制备纳米级锶铁氧体(SrFe_(12)O_(19))．用X-射线衍射仪(xRD)、振动样品磁强计(VSM)、场发射扫描电镜(FESEM)对锶铁氧体粉进行表征,研究了锶铁氧体的生长过程和反应过程的机理以及锶铁氧体的磁性能随着温度的变化．结果表明:采用“两步法”对凝胶进行热处理减少了非磁性物质的形成,降低了获得单相锶铁氧体的温度．银铁氧体在600～700℃开始形成,在900℃获得单一组成的锶铁氧体,在800℃焙烧的锶铁氧体其矫顽力出现最大值H_c=454．16 kA/m,比饱和磁化强度σ_s=55．91 A·m^2/kg．By means of inorganic salt precursor of strontium nitrate and ferric nitrate, the sol was confected by non-stoichiometry and the citric acid sol-gel method was used to prepare Sr-ferrite nanoparticles. The Sr-ferrites were characterized by X-ray diffraction （XRD）, vibrating sample magnetometer （VSM） and filed-emission scanning electronic microscope （FESEM）. The development process, forming mechanism and the magnetic properties with temperature of Sr-ferrite were analyzed. The results show that the annealing of gels by ＂two steps＂ method decreased non-magnetic material and declined the Sr- ferrite temperature of forming singleness. The Sr-ferrite forms at the temperature of 600-700 ℃ and the singleness is acquired at the temperature of 900 ℃, the Sr-ferrite growth is consistent of the variety of magnetic properties. The maximum coercivity value was gained at 800 ℃, the coercivity value （He） and the specific saturation magnetization value （σs） is 454.16 kA/m, 55.91 A·m^2/kg .

关 键 词：无机非金属材料 溶胶-凝胶法 锶铁氧体 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]