Broadband dielectric and conductivity spectra of dielectric - metal nanocomposites for microwave applications

0423078 - FZÚ 2014 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Borisova, A. - Machulyansky, A. - Yakymenko, Y. - Bovtun, Viktor - Kempa, Martin - Savinov, Maxim
Broadband dielectric and conductivity spectra of dielectric - metal nanocomposites for microwave applications.
2013 IEEE 33rd International Scientific Conference Electronics and Nanotechnology (ELNANO). New York: IEEE, 2013, s. 21-24. ISBN 978-1-4673-4672-6.
[IEEE 33rd International Scientific Conference on Electronics and Nanotechnology (ELNANO). Kyiv (UA), 16.04.2013-19.04.2013]
Grant CEP: GA ČR GAP204/12/0232
Institucionální podpora: RVO:68378271
Klíčová slova: dielectric-metal nanocomposites * dielectric and conductivity spectra * percolation * microwave properties
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Three kinds of dielectric-metal nanocomposites were prepared and studied: epoxy resin-xFe (x = 0-30 vol.%; b) epoxy resin-xNi (x = 0-40 vol.%); c) paraffin-xFe (x = 10-60 vol.%). Their dielectric and ac conductivity spectra were measured in a broad frequency range from 10^(-2) Hz to 10^(10) Hz. Dielectric/conductivity dispersion was observed in the whole frequency range. Increase of the metal content results in the increase of the composite dielectric permittivity, loss and conductivity in the whole frequency range. The power-law dispersion of conductivity and permittivity characterizes response in the microwave range for all studied composites. For the compositions with high metal content, above the percolation threshold, the conductivity plateau screens the power-law dispersion at low frequencies. Three contributing polarization/conductivity mechanisms are considered, possibilities of the composites microwave applications are discussed.
Trvalý link: http://hdl.handle.net/11104/0229157