【摘要】 利用直流电弧等离子法在105Pa H2+Ar混合气氛下制备了Fe,Ni及FeNi合金纳米粒子,通过XRD,TEM,XPS,VSM及TC-436(LECO LTD.)N/O分析仪等对纳米粒子结构、形貌、成分、表面状态及静态磁性能进行了表征,并通过矢量网络分析仪,利用同轴波导的方法对金属纳米粒子进行了电磁参数的测定。结果发现:在2~8GHz频率范围内,Fe,Ni,FeNi合金纳米粒子/固体石蜡复合材料的复介电常数虚部ε″在3~4,7~10,14~16GHz频段均出现三个峰值,随着Fe元素含量的增加,FeNi合金纳米粒子的复介电常数ε″损耗值成规律性的增加;复磁导率实部μ′也逐渐增大,且在2~4GHz范围出现极大值,复磁导率虚部μ″吸收峰值向高频段移动,而且当成分(质量分数/%)为Fe49.00Ni和Fe28.35Ni时,材料的吸收频带展宽。更多还原

【Abstract】 The DC arc plasma was used to prepare Fe,Ni and FeNi alloy nanoparticles in a mixture of H₂ and Ar gas atmosphere.The distinct characterization and content of the Fe,Ni and FeNi alloy nanoparticles were investigated by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,vibrating sample magnetometer （VSM） and TC-436（LECO LTD.）N/O analysis apparatus.The electromagnetic characteristics of the Fe,Ni and FeNi alloy nanoparticles were further measure by Agilent 8722ES microwave network analyzer in 2¹8GHz range.The experimental results show that the ε″of the Fe,Ni,FeNi alloy nanoparticles all appeared the maximum values at 3～4,7～10,14～16GHz,respectively.the ε″and μ′of the FeNi alloy nanoparticles were inversely proportional to the content of Ni,the maximum values of μ′present at 2～4GHz,and the maximum values of μ″ move to high frequency with the increasing of Fe’s content.The novel materials could be synthesized for microwave absorptive materials in the several GHz range with the different content of the Fe and Ni.更多还原