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采用溶胶-凝胶结合氢气还原方法,制备了Fe与TiO2两相共存的纳米复合物。透射电子显微镜(TEM)图片显示,纳米复合物的颗粒大小为100~300nm,且具有明显的核/壳结构。X射线衍射结果表明,纳米复合物中存在a-Fe与金红石型TiO2结构,未发现其他杂相。振动样品磁强计(VSM)的测量结果表明,样品具有较高的比饱和磁化强度。研究表明,通过控制前驱物的用量,能有效改变样品的磁性。热重分析(TGA)结果表明,样品具备很好的抗氧化性。复合介电谱和磁谱表明,在测量的微波频率范围内,样品的介电损耗大于磁损耗。
The sol-gel combined with hydrogen reduction method was used to prepare nanocomposites in which two phases of Fe and TiO2 coexisted. Transmission electron microscopy (TEM) images show that the nanocomposite particle size of 100 ~ 300nm, and has a clear core / shell structure. X-ray diffraction results show that there is a-Fe and rutile TiO2 structures in the nanocomposites, and no other heterogeneous phases are found. Vibrational sample magnetometer (VSM) measurement results show that the sample has a higher specific saturation magnetization. Research shows that by controlling the amount of precursor, the sample can effectively change the magnetism. Thermogravimetric analysis (TGA) results show that the sample has good oxidation resistance. The composite dielectric and magnetic spectra show that the dielectric loss of the sample is greater than the magnetic loss over the measured microwave frequency range.