期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 35, 期 4, 页码 1219-1225出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.10.034
关键词
Cermet; Dielectric property; Permeability spectra; Metamaterial
资金
- National Natural Science Foundation of China [50772061, 51172131, 51402271]
- Fundamental Research Funds for the Central Universities [201413001]
- China Postdoctoral Science Foundation [2014M550375]
- Qingdao Science and Technology Plan [14-2-4-118-jch]
Copper/yttrium iron garnet (Cu/Y3Fe5O12) cermets with tailored microstructures were prepared via a facile wet chemical process. The radio-frequency permeability and permittivity spectra of the cermets were investigated in detail. A percolation phenomenon appears with increasing copper contents, and an ultra-low percolation threshold (<5.47 vol%) is obtained. For the cermets below percolation threshold, the frequency dispersion of permittivity is featured with a poly-dispersive Debye type relaxation process. For the cermets above but still near percolation threshold, plasma-like negative permittivity featured with fano-like resonances was obtained. The Cu/Y3Fe5O12 cermet is a potential candidate for electromagnetic cloaking, microwave attenuation and telecommunications, etc. (C) 2014 Elsevier Ltd. All rights reserved.
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