摘要
以十二烷基苯磺酸钠为表面活性剂,利用超声辅助共沉淀法制得纳米晶NiFe2O4前驱体,通过焙烧前驱体得到反尖晶石型NiFe2O4纳米颗粒。采用X射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)、振动样品磁强计(VSM)、动态光散射(DLS)和Zeta电位对前驱体及其热解产品进行表征。结果表明,前驱体的平均晶粒粒径及分散颗粒粒径分别为15nm和45nm,其饱和磁化强度为26.1A?m2/kg,剩磁和矫顽力较大;500℃焙烧前驱体2h得到平均晶粒粒径约为21nm,颗粒粒径约为85nm的反尖晶石型NiFe2O4纳米晶,其饱和磁化强度为37.9A?m2/kg,具有较低的矫顽力和剩磁,显示良好的超顺磁性。
The nanocrystalline NiFe2O4 precursor was prepared by ultrasound-assisted coprecipitation in the presence of surfactant dodecyl benzene at room temperature,then the nanocrystalline NiFe2O4 with inverse spinel structure was obtained by calcining the precursor.The precursor and its calcined products were characterized by using XRD,FTIR,VSM,DLS and Zeta.The results showed that,the average grain diameter and average dispersive particle diameter of nanocrystalline NiFe2O4 precursor were 15nm and 45nm,respectively,and its saturation magnetization was 26.1 A·m^2/kg.The inverse spinel nanocrystalline NiFe2O4 with 21nm in the average grain diameter was obtained by calcining the precursor at 500 for 2h,and the average particle diameter was 85nm.The saturation magnetization of NiFe2O4 was 37.9 A·m^2/kg,also had lower coercivity and remanence,showing better superparamagnetism.
出处
《磁性材料及器件》
CAS
CSCD
北大核心
2011年第3期27-29,59,共4页
Journal of Magnetic Materials and Devices
基金
国家863计划资助项目(2007AA021801)
