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核壳结构SrFe12O19NiFe2O4复合纳米粉体的吸波性能

, PP. 111-116

Keywords: SrFe12O19,NiFe2O4,磁性纳米粉体,核-壳结构,吸波性能

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Abstract:

以Fe(NO3)3、Ni(NO3)2和Sr(NO3)2为主要原料,通过两步柠檬酸盐溶胶-凝胶法,制备出核-壳结构SrFe12O19-NiFe2O4磁性纳米复合粉体。采用XRD、TEM、VSM及矢量网络分析仪对合成的粉体的结构、形貌及吸波性能进行了分析研究。结果表明,复合粉体的相结构与NiFe2O4含量有关,当SrFe12O19与NiFe2O4的质量比为1∶2、烧结温度为1050℃时,复合纳米粉体的相与NiFe2O4接近,核-壳结构SrFe12O19-NiFe2O4纳米复合粉体的饱和磁化强度(Ms)(51.4emu/g)比单体SrFe12O19纳米粉体(42.6emu/g)的大;但矫顽力(Hc)(336Oe)比单体SrFe12O19纳米粉体的小,在SrFe12O19与NiFe2O4的矫顽力5395~160Oe之间。在频率为8~18GHz范围内,微波吸收逐渐增强,当频率为12GHz时,SrFe12O19-NiFe2O4纳米复合粉体的微波吸收达到最大值-9.7dB,是一种性能优良的吸波材料。

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