采用溶胶-凝胶自燃烧法制备了镧取代锶铁氧体(Sr1-xLaxFe12O19),用X射线衍射仪(XRD)、扫描电镜(SEM)和HB8510网络矢量分析仪研究了镧取代对锶铁氧体的结构、形貌和电磁性能的影响.结果表明,经900℃煅烧后,纯六角晶系磁铅石结构的锶铁氧体晶相生成.La3+取代摩尔数为0.1和0.2时,锶铁氧体的结构没有变化,未出现杂相.La3+具有抑制铁氧体晶粒生长的作用.当La3+取代量为0.1时,可使锶铁氧体的复介电常数和复磁导率的值升高,但当La3+取代量增加到0.2时,又使复介电常数和复磁导率的值降低.Sr09La01Fe12O19的样品具有最大的介电损耗角正切tanδε值和磁损耗角正切tanδμ值,分别为0.01和0.26.
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