【摘要】 利用甘氨酸作为燃料和配合剂,采用自蔓延燃烧法制备纳米晶钴铁氧体,并通过X射线衍射、扫描电子显微镜和振动样品磁强计表征样品的结构和磁性能.结果表明,平均晶粒尺寸对样品的磁性能影响较大,晶粒尺寸随烧结温度的变化而变化,并得到了矫顽力Hc和比饱和磁化强度σs随烧结温度的变化曲线.更多还原

【Abstract】 High coercivity magnetic nanoparticles(CoFe2O4) were synthesized by the combustion method with glycine as fuel followed by proper thermal annealing treatment to induce the crystallization.Structural and magnetic properties of the products were investigated via X-ray diffractometry,a scanning electron microscopy,and a vibrating sample magnetometer,respectively.The magnetic properties of the products were greatly affected by the average crystalline size of the nanoparticles.By controlling the thermal annealing treatment,the coercivity(Hc) and saturation magnetization(σs) of the nanoparticles can be well tuned as a function of temperature.The range of the annealing temperature is from 500 ℃ to 900 ℃.更多还原