Y^(3+)掺杂对CoFe_(2-x)Y_xO_4铁氧体离子占位的影响

Effect of Y^(3+) Doped on Ions Occpuied of CoFe_(2-x)Y_xO_4 Ferritte

采用溶胶-凝胶自燃烧法制备了CoFe2-xYxO4(x=0,0.1,0.2,0.3,0.4,0.5)铁氧体纳米粉末体,进行了500℃热处理。采用VSM测试了其比饱和磁化强度,根据比饱和磁化强度(σs)与总磁化强度(Ms)的关系计算了Y3+掺杂对晶格中由B位迁移到A位的Co2+物质的量的值(y);随着Y3+掺杂量的增加,迁移的Co2+的物质的量先增加后减少。并用Mssbauer谱技术进行了佐证,根据拟合的数据分析了Y3+掺杂后晶体中A位和B位的Fe3+的迁移规律;讨论了A位和B位的峰面积比值。

CoFe2-xYxO4 （x=0,0.1,0.2,0.3,0.4,0.5） ferrite powders were synthesized by the sol-gel self-combustion method and heat treated at 500 ℃.The effect of Y3＋ doped on ions occupied of CoFe2-xYxO4 （x=0.1,0.2,0.3,0.4,0.5） ferrite powders were studied by theory calculated and Mssbauer spectra.According to the relation between specific saturation magnetization （σs） and magnetization （Ms）,y value of ions migration from B sites to A sites for Y3＋ doped cobalt ferrite were calculated.With the gradual increase in Y3＋ doped content,Co2＋ mole first increases and then decreases.The migration law of Fe3＋ from B sites to A sites which Y3＋ doped cobalt ferrite was studied by fitting data of Mssbauer spectra,and ratio of peaks area of A sites and B sites was discussed.