采用一种低温且快速的溶胶凝胶自燃法制备了YIG和Bi∶ YIG系列纳米材料,通过工艺优化,得到了高纯、结晶均匀的纳米晶.利用X射线衍射(XRD)、透射电子显微镜(TEM)、振动样品强磁计(VSM),系统研究了Bi3+对其物相、结构、形貌和磁性的调控作用.结果表明:Bi3+掺杂可以有效降低石榴石相的合成温度,同时晶胞参数有一定程度的增大.经过Bi3+掺杂,纳米晶的颗粒度也有一定程度减小,这很可能与较低的热处理温度有关.YIG和Bi∶ YIG都表现出明显的铁磁性,在磁场为2000 Oe时即可达到饱和.与YIG相比,Bi∶ YIG的饱和磁化强度明显降低,这与Bi3+掺杂削弱了Fe3+之间的超交换相互作用有关.
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