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High-frequency magnetic and dielectric properties of a three-phase composite of nickel, Co2Z ferrite, and polymer

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4 Author(s)
Li, Bao-Wen ; Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People’s Republic of China ; Shen, Yang ; Zhen-Xing Yue ; Nan, Ce-Wen

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A three-phase, double-percolating composite with Co2Z ferrite particles and nickel particles embedded in a poly(vinylidene fluoride) matrix was prepared by using a simple low-temperature hot-pressing technique. The large ferrite particles in the composite not only act as the magnetic phase but also present as a high volume fraction discrete (nonpercolating) phase, confining polymer and metallic particles into a continuous double-percolating structure of low volume fraction. With the addition of a small number of magnetic nickel particles, a large enhancement in both initial permeability and dielectric constant of the three-phase composite was observed. This can be explained by effective medium approach and percolation theory. The three-phase composite showed both frequency-independent inductive and capacitive properties in the high-frequency range up to ∼500 MHz. Such a multifunctional magnetic-electric three-phase composite could be used in high-frequency communications and electromagnetic interference filters not only as an inductor but also as a capacitor.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 12 )

Date of Publication:

Jun 2006

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