采用直流电弧等离子体蒸发法合成Fe纳米粒子,并与石蜡混合制备出Fe/石蜡纳米复合材料,测定在2-18 GHz频率范围内的复介电谱.结合普适介电理论、德拜弛豫理论及Cole-Cole方程对该类材料的复介电谱进行拟合并与实测谱进行比较.结果表明:普适介电理论能拟合介电常数的基本变化趋势,而Cole-Cole方程能更准确地拟合介电常数的变化规律.这表明Fe/石蜡纳米复合材料在微波段的多重极化机制可等效为取向极化机制.
Fe nanopartilces synthesized by a DC arc-discharge plasma method were mixed with paraffin to fabricate nanocomposites.Dielectric spectra of these Fe/ paraffin nanocomposites were measured in 2-18 GHz range.Theoretical fitting of the complex permittivity spectra were carried out using the universal dielectric law,Debye relaxation theory and Cole-Cole equation,and compared with the measured ones.The results show that the universal dielectric law can be used to fit the essential outline,but Cole-Cole equation can accurately exhibit fluctuation of the complex permittivity spectra.It is also confirmed that the polarization mechanism may be equivalent to orientation polarization instead of the multipolarization in microwave range.
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