【摘要】 采用溶胶凝胶法合成了钴铁氧体纳米晶铁氧体,系统研究了柠檬酸的用量、pH值、烧结温度对样品的结构及磁性能的影响,采用了热重-差热、X射线衍射、振动样品磁强计等手段对样品进行了表征。结果表明:柠檬酸在CoFe₂O₄的形成过程中起了很重要的作用,烧结温度对样品的磁性能的影响最大,所得样品的矫顽力范围是730×80 A/m到1548×80A/m,平均晶粒尺寸的范围为20到90nm更多还原

【Abstract】 CoFe₂O₄ nanocrystaUine ferrites were synthesized with the sol-gel and self-combustion method,and then the influence of the citric acid concentration,pH value and sintering temperature on the microstructure and magnetic properties of the as-prepared samples was discussed using X-ray diffraction（XRD） and vibrating sample magnetometer（VSM）.The result indicated that citric acid played an important role in the formation of spinel phase of CoFe₂O₄.Sintering temperature had the most significant influence on the magnetic properties of the CoFe₂O₄ powders.The coercivity（H_c） decreased from 1548×80 to 730×80 A/m and the saturation magnetization（M_s） decreased from 57 to 78（A·m²）/kg with the sintering temperature from 450 to 950 ℃.The average size of as-prepared CoFe₂O₄ nanoparticles had a size range of 20 to 90 nm.更多还原