摘要
采用高能球磨法制备Fe_3O_4纳米磁性颗粒,用XRD、VSM、SEM等方法对样品进行表征并用四端法对样品的电导率进行测量,然后对样品的结构性能作定性和定量分析。结果表明:随着研磨时间增加,Fe_3O_4晶粒的衍射峰变宽,衍射峰强度减弱,同时有少量α-Fe_2O_3生成;晶格的显微应变增加;Fe_3O_4磁性颗粒的饱和磁化强度降低,矫顽力先变大后减小;对压片后样品的电导率进行测试,发现电导率降低;随着研磨时间增加,晶粒会出现团聚现象,形成粒径更大的二次颗粒,为防止该现象,研磨时间应控制在110 h左右。
Magnetic Fe3O4 nanoparticles were prepared by a method of high energy ball mill, and samples were characterized by XRD, VSM and SEM. Simultaneously, conductivity of that was measured by fourterminal method. Then, those samples were qualitative and quantitative analyzed on structure property of grain. The results indicate that the diffraction peak of nanoparticles were wider, and diffraction peak strength of that were weaken. Meanwhile, a few nanoparticles were generated and microscopic strain of lattice increased. Saturation magnetization strength of magnetic Fe3O4 nanoparticles decreased, and coercive force would increase at the beginning and then decreased with time. Being tested on electrical conductivity of pressed samples, we can find that electrical conductivity would decrease. As the grinding time increasing, the agglomeration of grain will happen, which form larger secondary particles. To avoid this phenomenon, grinding time should be controlled at about 110 h.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第11期3192-3196,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金项目(51165012)
