以Fe（NO3）3、Ni（NO3）2和Sr（N0s）2为主要原料，通过两步柠檬酸盐溶胶一凝胶法，制备出核一壳结构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，核一壳结构SrFe12O19-NiFe2O4纳米复合粉体的饱和磁化强度（Ms）（51．4emu／g）比单体SrFel201。纳米粉体（42．6emu／g）的大；但矫顽力（H。）（336Oe）比单体SrFel2019纳米粉体的小，在SrFel2019与NiFe204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。
The nanoscale magnetic composite powders SrFe12O19-NiFe2 04 with core-shell structure were prepared by two- step citrate sol - gel, with Fe（NO3）3 Ni（NO3）2 and Sr（NO3）2 as the main materials. The XRD, TEM, VSM and vector network analyzer were used to analyze the structure, feature and absorbing quality of the nano-powder. The results show that the phase structure of the powder is related to the content of NiFe204, when the mass ratio of SrFel2Ol9 to NiFe2O4 is 1 ： 2 and calcined temperature is 1050℃, the phase of the powder is similar than that of NiFe204, the magnetization（Ms）of SrFe12 O19 and the coreshell nano-powde raises from 42.6 emu/g to 51.4 emu/g, and the coercivity（Hc） is 336 Oe, which is between that of SrFe12O19 （5395 Oe） and NiFe2O4 （160 Oe）. The absorbing quality is enhanced when the frequency is from 8 GHz to 18 GHz. When the frequency is 12 GHz, the microwave absorption can reach maximum point which is -9. 7 dB. The composite nano- powder is an excellent absorbing material.
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