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.

具有负介电常数的材料由于其在各种电磁设备和电子设备中的应用前景而备受关注。在此，烧结渗渗的镍/金红石金属陶瓷，在高频区域研究其介电和磁性能。随着镍含量的增加，渗透性金属陶瓷的电导率显着增加，并且导电机理从跳变变为金属行为。渗滤金属陶瓷中介电常数的增加归因于界面极化的增加，而镍含量超过渗滤阈值的渗滤金属陶瓷的负介电常数是由于离域电子的等离子体振荡引起的。与此同时，ε负金属陶瓷的磁导率小于1，这是由相互连接的导电网络内的涡流引起的高频反磁响应引起的。这项工作阐明了渗滤金属陶瓷的异常介电和磁性能，并且确定的反磁性是ε负复合材料在高频下的固有特性。