Negative dielectric permittivity and high-frequency diamagnetic responses of percolated nickel/rutile cermets
Negative dielectric permittivity and high-frequency diamagnetic responses of percolated nickel/rutile cermets
复制标题
渗滤镍/金红石金属陶瓷的负介电常数和高频抗磁响应
DOI：
10.1016/j.compositesa.2020.106132
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发表时间：
2020-12
期刊：
影响因子：
--
通讯作者：
Fan Runhua
中科院分区：
文献类型：
--
作者：
Fan Guohua;Wang Zhongyang;Wei Zaixin;Liu Yao;Fan Runhua
负介电常数材料由于其在各种电磁设备和电子器件中的应用前景而引起了人们的广泛关注。本文采用烧结法制备了镍基金红石金属陶瓷，研究了其在射频区的介电性能和磁性能。随着镍含量的增加，导电金属陶瓷的电导率显著提高，导电机制由跳跃型向金属型转变。正介电常数的提高归因于界面极化的增加，而负介电常数的镍含量超过逾渗阈值的陶瓷是由离域电子的等离子体振荡引起的。同时，ε-负金属陶瓷的磁导率小于1，这是由于互连导电网络内的涡流感应高频抗磁响应所致。这项工作阐明了反常的介电和磁性能的烧结金属陶瓷和确定抗磁性是一个固有的性质ε-负的metcomposites在高频。
Materials with negative permittivity have attracted considerable attention due to their promising applications in various electromagnetic equipment and electronic devices. Herein, percolative nickel/rutile cermets were sintered, of which the dielectric and magnetic properties were investigated in radio-frequency region. With nickel content increasing, electrical conductivity of the percolative cermets increased dramatically and the conduction mechanism changed from hopping to metallic behavior. Enhancement of positive permittivity in the percolating cermets was attributed to the increased interfacial polarization, while negative permittivity of the percolated cermets with nickel content exceeding percolation threshold was caused by plasma oscillation of delocalized electrons. Meanwhile, magnetic permeability of the epsilon-negative cermets was smaller than 1, which was resulted from the induced high-frequency diamagnetic response of eddy currents within the interconnected conductive networks. This work elucidated the anomalous dielectric and magnetic properties of percolated cermets and determined diamagnetism is an inherent nature of epsilon-negative metacomposites at high frequency.
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