摘要
用溶胶-凝胶法制备了La、Ce、Zn掺杂锶铁氧体Sr0．7La0.15Ce0．15Fe11．7Zn0.3O19纳米粉晶，再通过原位聚合反应法制备了掺杂锶铁氧体／聚苯胺（PAn）复合材料。用XRD、SEM、FTIR对样品进行表征，用微波网络分析仪测量了样品在2～12．4GHz频率范围的微波反射率（R）。研究结果表明，聚苯胺包覆于掺杂锶铁氧体粒子表面，Sr0．7La0．15Ce0.15Fe11．7Zn0．3O19／PAn微波吸收性能优良，具有磁损耗和电损耗协同作用。复合样品厚度为3mm时，10GHz频率位置吸收峰值为-28dB，〉10dB吸收带宽为4．7GHZ。从R随频率变化的曲线趋势看，最佳匹配厚度为2．6mm，吸收峰值接近-40dB，峰值频率高于12．4GHZ，〉10dB吸收带宽预计达到5．5GHz。
The nano-crystalline powder sample of Sr0.7La0.15Ce0.15Fe11.7Zn0.3O19/PAn as a strontium ferrite doped with La,Ce and Zn was prepared by sol-gel technique. The doped strontium ferrite/polyaniline （PAn） nanocomposite sample was synthesized by in situ polymerization. The sample was characterized by XRD, SEM,FTIR spectrum. The reflectance （R） of these samples was measured by microwave network analyzer in the frequency range from 2 to 12.4GHz. The results showed that the doped strontium ferrite powders were successfully coated with PAn and Sr0.7 La0.15 Ce0.15 Fe11. 7 Zn0.3 O19/PAn nanocomposite exhibited excellent microwave absorption properties because of a cooperative mechanism of electric and magnetic loss. The microwave absorption peak of the composite was --28dB at 10GHz and the absorption bandwidth greater than 10dB was 4.7GHz when its thickness was 3mm. From the trend of R changing with frequency, the best match thickness was 2.6mm so that microwave absorbing peak was near -40dB at a frequency higher than 12.4GHz and the absorption bandwidth greater than 10dB was expected to reach 5.5GHz.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第5期720-723,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(60771028)
湖南省科技计划资助项目(05JT1034)
