摘要
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 par affin to fabricate nanocomposites. Dielectric spectra of these Fe/ paraffin nanocomposites were mea- sured 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 mea- sured 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 con- firmed that the polarization mechanism may be equivalent to orientation polarization instead of the multi- polarization in microwave range.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第4期349-354,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金51271044和51171033
中央高校基本科研业务费专项基金DUT12ZD(G)04
DUT12JR11资助~~
