Applicability of effective medium theory to ferroelectric/ferrimagnetic composites with composition and frequency-dependent complex permittivities and permeabilities
Applicability of effective medium theory to ferroelectric/ferrimagnetic composites with composition and frequency-dependent complex permittivities and permeabilities
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DOI：
10.1063/1.361010
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发表时间：
1996-02-01
影响因子：
3.2
通讯作者：
Grosvenor, J
中科院分区：
文献类型：
--
作者：
Mantese, JV;Micheli, AL;Grosvenor, J
用高频(1 MHz-1 GHz)传输线测量了铁电/铁磁(钛酸钡和镁铜锌铁氧体)复合材料的组成、复介电常数和复磁导率。Maxwell-Garnett的有效介质规则给出了有效介电常数和磁导率的上下限，并给出了在任何一个组分的低体积填充分数下的体电和磁性质的准确估计，只要选择合适的基质即可。在整个组成范围内，Bruggeman理论给出了介电常数和磁导率的最佳预测值。在所有情况下，这些复数都被证明是受Bergman-Milton界的约束。(C)1996年美国物理研究所。
High-frequency (1 MHz-1 GHz) transmission line measurements were used to determine the composition and frequency-dependent complex permittivities and complex permeabilities of ferroelectric/ferrimagnetic (barium titanate and a magnesium-copper-zinc ferrite) composites. The effective medium rules of Maxwell-Garnett give both lower and upper bounds for the effective permittivities and permeabilities and yield accurate estimates of the bulk electric and magnetic properties at low volume fill fraction of either component provided the proper host matrix is chosen. Bruggeman theory yielded the best predictive values for the permittivity and permeability over the entire composition range. In all cases these complex quantities were shown to be constrained by Bergman-Milton bounds. (C) 1996 American Institute of Physics.