Fe掺杂ZnO粉末的制备及微波吸收性能研究

Preparation and microwave absorption property of Fe-doped ZnO powder

采用简单的化学共沉淀法制备Fe掺杂ZnO粉末。通过X射线衍射（XRD）仪、X射线光电子能谱（XPS）仪、扫描电子显微镜（SEM）、能量色散X射线谱（EDS）仪、振动样品磁强计（VSM）和矢量网络分析仪（VNA）对复合材料的结构、微观形貌、磁性能和电磁参数进行表征。结果表明,Fe离子掺杂进入ZnO晶格,粉末中ZnO和ZnFe2O4物相共存,且Fe离子的价态为＋3;Fe掺杂ZnO呈片状和花状形貌,具有明显的铁磁性。Fe掺杂ZnO/石蜡复合物在2~18GHz频率范围的微波吸收机制以介电损耗为主;当吸波涂层厚度为2.0mm时,最大吸收峰值达-33.7dB,低于-10dB的吸收频宽为5.0GHz。

Fe-doped ZnO powders were synthesized by a facile chemical coprecipitation method.The morphology,structure,magnetic performance and electromagnetic parameters of the as-prepared powders were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,vibrating sample magnetometer（VSM）and vector network analyzer（VNA）.The results showed that the Fe ions were successfully incorporated into ZnO crystal with an oxidation state of＋3,and ZnO and ZnFe2O4 phase were coexisted in the powders.A flake and flower-like morphology and typical ferromagnetic behavior were observed in Fe-doped ZnO.The Fe-doped ZnO/paraffin complex exhibited significant dielectric loss characteristic in the frequency range of 2~18GHz.The maximum reflection loss reached-33.7dB and the effective absorption bandwidth（RL≤-10.0dB）was5.0GHz with a layer thickness of 2.0mm.