稀土及过渡金属替代M型钡铁氧体的磁性能

Magnetic properties of rare earth and transition metal substituted M-type barium ferrite

为系统研究稀土离子替代钡离子对M型钡铁氧体结构及磁性能的影响,用溶胶-凝胶法合成了稀土离子替代的Ba1-xRexFe12O19(x=0.05,Re=La3+、Pr3+、Nd3+、Sm3+、Gd3+、Dy3+、Yb3+)。结果发现,样品的饱和磁化强度Ms基本上随离子半径减小而减小,而矫顽力Hc则与稀土离子轨道量子数变化趋势相同。在此基础上,为进一步改善样品磁性能,采用相同制备方法合成了Re3+Zn2+及Re3+Zn2+Mn2+复合替代M型钡铁氧体Ba1-xRexFe12-xZnxO19和Ba1-xRexFe12-xMn0.5xZn0.5xO19,研究了过渡金属离子锌离子Zn2+及Mn2+替代Fe3+对磁性能的影响,同时根据磁性能的比较,讨论了替代离子Zn2+及Mn2+的优先占位情况。

In order to systematically study the influence of rare earth ion substitution on the structure and magnetic properties of M-type barium ferrite, Ba1-xRexFe12O19（x=0.05,Re=La^3＋、Pr^3＋、Nd^3＋、Sm^3＋、Gd^3＋、Dy^3＋andYb^3＋） ferrite materials were prepared by sol-gel method. The XRD and VSM were used to observe and measure the phase structures and magnetic properties, respectively. Results showed that the saturation magnetization Ms decreases with the shrinkage of rare earth ions and the coercive force He enhances with increasing orbital quantum numbers of rare earth ions. In addition, the influence of transition metal ion Zn^2＋ and Mn^2＋ substitution for Fe^3＋ on the magnetic properties was also detected.