Enhanced Initial Permeability and Dielectric Constant in a Double‐ Percolating Ni0.3Zn0.7Fe1.95O4–Ni– Polymer Composite
Enhanced Initial Permeability and Dielectric Constant in a Double‐ Percolating Ni0.3Zn0.7Fe1.95O4–Ni– Polymer Composite
复制标题
DOI：
10.1002/adfm.200500045
复制
发表时间：
2005-07
影响因子：
19
通讯作者：
Yang Shen;Zhenxing Yue;Menglei Li;C. Nan
中科院分区：
文献类型：
--
作者：
Yang Shen;Zhenxing Yue;Menglei Li;C. Nan
通过简单的热压方法制备了一种新型的三相双晶复合材料，该复合材料具有嵌在聚偏氟乙烯基体中的NiZn铁氧体颗粒和镍颗粒。复合材料中的大铁氧体颗粒不仅充当磁性相，从而赋予复合材料高的初始磁导率，而且还存在（以高体积分数）离散（非结晶）相，将聚合物和金属颗粒限制在低体积分数的连续双结晶结构中。特别是，观察到三相复合材料的初始磁导率和介电常数都有很大的提高，这主要是由于添加了少量的镍颗粒，这些镍颗粒既充当磁性相又充当磁性金属相。在三相复合材料中观察到的介电和磁行为可以用有效介质和渗流理论来解释。
A novel, three‐phase, double‐percolating composite with NiZn‐ferrite particles and nickel particles embedded in a poly(vinylidene fluoride) matrix is prepared by a simple hot‐pressing method. Large ferrite particles in the composite not only act as a magnetic phase, thus endowing the composite with a high initial permeability, but also present (in a high volume fraction) a discrete (non‐percolating) phase, confining polymer and metallic particles into a continuous double‐percolating structure of low volume fraction. In particular, a large enhancement in both the initial permeability and the dielectric constant of the three‐phase composites is observed, which is due mainly to the addition of a small number of nickel particles that act as both magnetic and percolative metallic phases. The dielectric and magnetic behavior observed in the three‐phase composites can be explained by effective‐medium and percolation theories.