【作者】 方庆清； 汪金芝； 焦永芳； 李锐；

【Author】 FANG Qing-qing, WANG Jin-zhi, JIAO Yong-fang, LI Rui (College of Physics and Material Science, Anhui University, Hefei 230039, China)

【机构】 安徽大学物理与材料科学学院；

【摘要】 采用溶胶-凝胶方法制备纳米尺度钴锌铁氧体Zn0.6CoxFe2.4-xO4(x=0-0.30)颗粒,利用X射线衍射仪(XRD)分析晶体结构和相变过程,利用振动样品磁强计(VSM)对其磁性进行测量和分析。实验结果表明,钴锌铁氧体Zn0.6Co0.15Fe2.25O4在800℃时生成单一尖晶石相锌钴铁氧体,在550-800℃温度区间出现α-Fe2O3过渡相。随钴含量的增加,Zn0.6CoxFe2.4-xO4的比饱和磁化强度先增后减,x=0.075-0.15比饱和磁化强度较高;Zn0.6CoxFe2.4-xO4在1300℃时x=0.075的矫顽力为47163.6A/m,x≥0.15时矫顽力在1200℃附近随温度缓慢上升,在1200-1300℃之间为平台状态,并且随钴含量的增加,矫顽力略有升高。在x=0.10附近,可同时获得较高的比饱和磁化强度和较高的矫顽力。更多还原

【Abstract】 A series of nanocrystalline powders Zn0.6COxFe2.4-xO4(x=0-0.30) were synthesized by the sol-gel technique. The structure and magnetic properties was investigated and analyzed through the X-ray Diffraction (XRD) patterns and the Vibrating Sample Magnetometer (VSM). The experimental results show that a-Fe2O3 transitional phase appears during the temperature range from 550℃ to 800℃. Single-phase zinc-cobalt ferrites with spinel structure are obtained when the temperature is beyond 800℃. With relatively higher values of the cobalt content x=0.075-0.15, the specific saturation magnetization climbs up at first and then falls down due to the increase of the cobalt content. The coercive force strength Hc of Zn0.6CoxFe2.4-xO4 reaches its highest value 47163.6A/m when x=0.075 at 1300℃. He increases slowly with temperature near 1200℃ when x≥0.15 and remains in a flat state at 1200-1300℃ and moderate increase is obtained by increasing the x value. High specific saturation magnetization and coercive force strength can be obtained simultaneously when the cobalt content is near 0.10. simultaneously.更多还原