采用溶胶-凝胶法制备了Tb掺杂的BiFeO3粉晶,其掺杂浓度为0≤x≤0.2,分别用X射线衍射仪、Raman散射仪和综合物性测量系统对Bi1-xTbxFeO3粉晶样品的结构、Raman活性振动模式和磁性进行了测量和分析.实验结果表明:当Tb掺杂量x在0.10～0.125时,母体BiFeO3的结构由菱形R3c相变为正交Pnma相,同时伴随着铁电-顺电相的变化.另外,随着掺杂浓度的增大,Bi1-xTbxFeO3的磁性逐渐增强,并且在铁电-顺电相相变边界处(x=0.10),剩余磁化强度Mr达到最大值0.223emu/g,约为纯相BiFeO3的8倍.随着Tb掺杂量进一步增大(x≥0.125),样品的剩余磁化强度开始逐渐减小,其原因是在正交相的样品中磁矩逐渐形成了很好的反平行排列.
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