Zn^(2+)掺杂对NiFe_2O_4纳米颗粒吸波性能的增强

Reinforcement of Zn^(2+) dopant on the microwave absorbing properties of NiFe_2O_4 nanoparticles

采用超声活化与化学共沉淀相结合的方法制备了结晶性良好的NiFe_2O_4和Ni_(0.5)Zn_(0.5)Fe_2O_4纳米颗粒,分析了Zn^(2+)掺杂对NiFe_2O_4结构和微波吸收性能的影响。X射线衍射和SEM检测结果表明样品的形貌大多为片状结构,NiFe_2O_4粒度约在30 nm左右,Ni_(0.5)Zn_(0.5)Fe_2O_4粒度约在70 nm,随着烧结温度增加结晶性提高。振动样品磁强计分析结果表明Zn^(2+)掺杂对NiFe_2O_4的磁化性能有显著影响,其矫顽力降低,饱和磁化强度提高。矢量网络分析仪分析结果显示在NiFe_2O_4中掺杂了Zn^(2+)后,微波吸收量显著提高,有效地改善了NiFe_2O_4的吸波性能,随着烧结温度加大,NiFe_2O_4和Ni_(0.5)Zn_(0.5)Fe_2O_4吸波性能也有所增加。

NiFe2O4and Ni0.5Zn0.5Fe2O4spinel nanoparticles with good crystallinity were prepared by the synergy of the ultrasonic reaction and the chemical co precipitation method.The microwave absorbing properties were improved by the Zn2+doping.XRD and SEM analysis indicated that the NiFe2O4and Ni0.5Zn0.5Fe2O4flaky nanoparticles,with size of30and70nm,respectively,showed better crystallization with the increasing temperature.The exploration of static magnetic properties showed that the coercive force of samples decreased,while the saturation magnetization of the samples was reinforced via the Zn2+doping.The testing results of the vector network analyzer showed that Zn2+doping effectively improved the microwave absorption properties of NiFe2O4,and the wave absorbing properties were also strengthened with the increasing calcination temperature.