Microwave characteristics of Co/TiO2 nanocomposites prepared by mechanochemical synthesis
Microwave characteristics of Co/TiO2 nanocomposites prepared by mechanochemical synthesis
复制标题
DOI：
10.1016/j.jallcom.2008.01.011
复制
发表时间：
2009-01
影响因子：
6.2
通讯作者：
Xia Ni;Ji Ma;Jiangong Li;D. Jiao;Juanjuan Huang;Xudong Zhang
中科院分区：
文献类型：
--
作者：
Xia Ni;Ji Ma;Jiangong Li;D. Jiao;Juanjuan Huang;Xudong Zhang
采用机械化学法制备了Co/TiO 2纳米复合材料。在0.1- 18 GHz频率范围内研究了Co/TiO 2纳米复合材料-石蜡混合物的微波特性。测得的Co/TiO 2纳米复合物-石蜡混合物的相对复介电常数表明Co/TiO 2纳米复合物的较高电阻率。结果表明，复合材料的相对复磁导率虚部在5.1GHz处出现一个宽的共振峰，这是Co的自然共振所致，Henkel图证实了复合材料中Co晶粒间的磁偶极耦合作用纳米复合材料导致共振峰向低频移动。计算的反射损耗曲线表明，Co/TiO 2纳米复合材料-石蜡混合物的最小反射损耗值在3.5GHz、样品厚度为3 mm时可达− 27 dB。
Co/TiO2nanocomposites were prepared by mechanochemical synthesis. The microwave characteristics of the Co/TiO2nanocomposite–paraffin wax mixture were studied in the 0.1–18GHz frequency range. The measured relative complex permittivity of the Co/TiO2nanocomposite–paraffin wax mixture indicates a higher electrical resistivity of the Co/TiO2nanocomposites compared to the pure Co. The imaginary part of the relative complex permeability of the mixture exhibits a broad resonance peak at 5.1GHz which results from the natural resonance of Co. The Henkel plots confirm that the magnetic dipolar coupling interaction between the Co grains in the nanocomposites leads to the shift of resonance peak to a lower frequency. The calculated reflection loss curves show that the minimum reflection loss value of the Co/TiO2nanocomposite–paraffin wax mixture can reach −27dB at 3.5GHz with 3mm sample thickness.