摘要
采用弱磁场辅助氧化共沉淀法制备了正八面体型和六方体型形貌的Fe3O4纳米粒子。X射线衍射结果表明:产物具有尖晶石结构,结晶良好且纯度高。扫描电子显微镜观察结果表明:产物Fe3O4纳米粒子均为二次粒子,由更小的粒子生长而成。经振动样品磁强计测定,各种形貌的Fe3O4纳米粒子都具有良好的磁性能。由于六方体型Fe3O4纳米晶形状的各向异性,其饱和磁化强度小于正八面体型形貌的Fe3O4纳米粒子。同时,初探了弱磁场影响不同形貌的Fe3O4纳米粒子的形成机制。
The octahedronal and hexagonal nano-Fe3O4 particles were prepared via a weakly magnetic field-assisted oxidative co-precipitation.The X-ray diffraction results show that the as-synthesized product is a well crystallized particle with a spinel structure and high purity.The scanning electron microscope images show that the product belongs to the secondary particles,which were grown from the smaller primary particles.The vibrating sample magnetometer test results indicate that the Fe3O4 nano-particles with various morphologies possess good magnetic properties,and the saturation magnetization of the hexagonal Fe3O4 nano-particles was smaller than that of the octahedron Fe3O4 nano-particles due to the shape anisotropy.The formation mechanisms for Fe3O4 nano-particles with various morphologies by oxidative co-precipitation in the presence of a weakly magnetic field were also discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第10期1618-1623,共6页
Journal of The Chinese Ceramic Society
关键词
弱磁场
氧化共沉淀
四氧化三铁
纳米颗粒
形貌
weakly magnetic field
oxidative-coprecipitation
ferroferric oxide
nanoparticle
morphology
