CoFe_2O_4及其膨胀石墨复合物的制备与电磁性能  

Preparation and Electromagnetic Properties of CoFe_2O_4 and Its Composites with Expanded Graphite

作　　者：许峰[1] 向晨[1] 李良超[1] 毛梦怡[1] 周琰[1] 丁艳[1] 李涓碧[1] 

机构地区：[1]浙江师范大学化学系,先进催化材料教育部重点实验室,金华321004

出　　处：《高等学校化学学报》2013年第10期2254-2261,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21071125);浙江省磁性材料重点创新团队(批准号:2010C11053);浙江省大学生新苗人才计划(批准号:2012R404002)资助

摘　　要：通过超声-共沉淀技术合成了CoFe2O4(CF)及CoFe2O4/膨胀石墨复合物(CF/EG),并表征了样品的微观结构、形貌、热稳定性和电磁性能.结果表明,CF的磁性能受沉淀剂类型和烧结温度等因素的影响,CF/EG复合物具有良好的导电性、磁性和电磁波吸收性能.EG与CF质量比为0.8的CF/EG复合物和石蜡制成的2.0 mm涂层(质量比1∶2)在13.52 GHz处的最小反射损耗为-16.08 dB,有效带宽达6.6 GHz,在10～18 GHz频段表现出良好的电磁波吸收性能.复合物的吸波性能主要来自于膨胀石墨的电导损耗和介电损耗、钴铁氧体的磁损耗、组分间的界面弛豫作用及协同效应.CoFe204 （CF） and the composites of CoFe204/expanded graphite （CF/EG） were prepared by ultrasound-co-precipitation method. The structures, morphologies, thermal stabilities, electrical and magnetic properties of the samples were characterized by modern measurement technology. The results indicated that the magnetic property of CF was influenced by precipitator type, sintering temperature, etc. CF/EG composites had excellent electrical conductivity and absorbing properties. The sample with 2.0 mm coating thickness, made by CF/EG composite with m（EG）/m（CF） of 0. 8 and paraffin, showed a minimum reflection loss of -16. 08 dB at 13.53 GHz and an available bandwidth of 6. 6 GHz in the range of 10--18.0 GHz. The absorb- ing properties of the composites originated mainly from the conductance loss and dielectric loss of EG, the magnetic loss of CF, the interface relaxation effect and synergistic effect between the two components.

关 键 词：钴铁氧体 膨胀石墨 超声-共沉淀法 电磁性能 吸波性能 

分 类 号：O614[理学—无机化学]