Radio-frequency epsilon-negative property and diamagnetic response of percolative Ag/CCTO metacomposites. (October 2021)

• Record Type: Journal Article
• Authors: Qu, Yunpeng; Wu, Jiada; Wang, Zhongyang; Liu, Yuan; Xie, Peitao; Wang, Zongxiang; Tian, Jiahong; Fan, Runhua
• Is Part Of: Scripta materialia. Number 203(2021)
• Publication Date: 2021-10
• Subjects: Metacomposites -- Epsilon-negative -- Dielectric constant -- Percolation -- Negative permittivity; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114067
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Here, Ag/CaCu3 Ti4 O12 (Ag/CCTO) percolative nanocomposites were fabricated by an in-situ synthesis, where the percolation-related transitions of dielectric and magnetic properties were investigated at radio-frequency band. Epsilon-negative property ( ε′ < 0) and diamagnetic responses ( μ′ < 1) were observed in percolated composites, owing to low-frequency plasmonic state and induced eddy currents within formed conductive Ag networks respectively. The competitive effect between polarization response of ε′ -positive CCTO matrix and collective plasma oscillation of ε′ -negative Ag networks leads to the tunable negative permittivity. The clarification of inductive character of ε′ -negative materials benefits constructing effective strategy for adjusting negative value of dielectric constant. Graphical abstract: Image, graphical abstract