Preparation and electromagnetic properties of composites of hollow glass microspheres coated with NiFe2O4 nanoparticles
The composites of hollow glass microspheres coated with NiFe2O4 nanoparticles were prepared using polyacrylamide gel method. The structural characteristics, morphology and electromagnetic properties of the composite powders with different glass microspheres weight percent of 25％, 50％ and 75％ were obtained by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), infrared spectroscopy (IR) and HP8510 network analyzer. The results indicated that the phase structure of composite powders was the mixtures of nickel ferrite, quartz and mullite. The peak intensity for nickel ferrite decreased rapidly and for mullite increased remarkably with the increasing amount of microspheres. A pure spinel structure of NiFe2O4 formed on the glass microspheres at 800℃. A uniform and continuous NiFe2O4-coating was obtained when the content of microspheres is 50 wt.％. A great amount of NiFe2O4 particle size is less than 80 nm. The composite with a content of 50 wt.％ microspheres exhibits better dielectric and magnetic loss which are useful to absorb more electromagnetic wave. Its density is only 1.2g/cm3. It can be a kind of good and light electromagnetic wave absorbing material in the X-band.
NiFe2O4 nanoparticles Hollow glass microspheres Dielectric and Magnetic loss Polyacrylamide gel method
赵海涛 马瑞廷 张罡 肖旋
沈阳理工大学材料科学与工程学院,沈阳110168
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）