材料科学
介电常数
电介质
凝聚态物理
放松(心理学)
共振(粒子物理)
相对介电常数
复合材料
核磁共振
光电子学
心理学
社会心理学
粒子物理学
物理
作者
Guohua Fan,Zhongyang Wang,H. Ren,Yao Liu,Runhua Fan
标识
DOI:10.1016/j.scriptamat.2020.08.027
摘要
In this work, dielectric behaviors of dielectric resonance, relaxation, and plasma-like negative permittivity are observed in percolative copper/rutile cermets. Transition for permittivity changing from positive to negative is associated with composition and determined by percolation. The resonance and relaxation responses are related to isolated metallic particles or clusters. Negative permittivity is induced by the plasmonic state of electrons within percolating pathways and dielectric loss of epsilon-negative composites is dominated by conduction loss. Besides, the percolative cermets change from electrical capacitive to inductive with the permittivity transition. Epsilon-negative cermets are expected to be used for electromagnetic shielding and coil-less electrical inductors.
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