Dual percolation behaviors of electrical and thermal conductivity in metal-ceramic composites
Dual percolation behaviors of electrical and thermal conductivity in metal-ceramic composites
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DOI：
10.1063/1.4941758
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发表时间：
2016-02
影响因子：
4
通讯作者：
Kai Sun;Zidong Zhang;Lei Qian;Feng Dang;Xijian Zhang;Ranran Fan
中科院分区：
文献类型：
--
作者：
Kai Sun;Zidong Zhang;Lei Qian;Feng Dang;Xijian Zhang;Ranran Fan
研究了铜/钇铁石榴石（Cu/YIG）复合材料的射频热、电性能及介电常数谱。有趣的是，由于铜颗粒网络的形成，获得了导电和导热的逾渗行为。超过电渗流阈值，观察到负介电常数和等离子体频率降低了几个数量级。随着铜含量的增加，热导率逐渐增加;同时，声子散射效应和热阻增强，热导率的增加速度逐渐减慢。Cu/YIG复合材料具有良好的电性能和热性能，有望在电磁屏蔽和电磁波衰减方面发挥巨大的潜力。
The thermal and electrical properties including the permittivity spectra in radio frequency region were investigated for copper/yttrium iron garnet (Cu/YIG) composites. Interestingly, the percolation behaviors in electrical and thermal conductivity were obtained due to the formation of copper particles' networks. Beyond the electrical percolation threshold, negative permittivity was observed and plasmon frequency was reduced by several orders of magnitude. With the increase in copper content, the thermal conductivity was gradually increased; meanwhile, the phonon scattering effect and thermal resistance get enhanced, so the rate of increase in thermal conductivity gradually slows down. Hopefully, Cu/YIG composites with tunable electrical and thermal properties have great potentials for electromagnetic interference shielding and electromagnetic wave attenuation.