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Characterization and dielectric properties of ß-SiC nanofibres
Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg 412 96, Sweden.
Jänis, A., Division of Sensor Systems, Swedish Defence Research Agency, Linkoping 581 11, Sweden.
Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg 412 96, Sweden.
2008 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 43, no 3, 1094-1101 p.Article in journal (Refereed) Published
Abstract [en]

SiC nanofibres produced by chemical vapour reaction technique are investigated using scanning and transmission electron microscopy. The nanofibres have been found to have a crystalline core of ß-SiC sheathed with thorn-like turbostratic carbon or amorphous Si/O/C, respectively. For this material, real and imaginary part of relative permittivity is measured in a frequency range of 1-18 GHz at room temperature. The results reveal that the permittivity and dielectric loss in the SiC nanofibres are a magnitude higher compared with sub-microcrystalline SiC powder. Composition and nanostructure are held responsible for the difference in dielectric properties. The mechanisms of dielectric loss in the SiC nanofibres are discussed based on interfacial polarization, lattice defects in the SiC nanofibre cores and conduction loss of turbostratic carbon in the thorn-like sheath of SiC nanofibres. © 2007 Springer Science+Business Media, LLC.

Place, publisher, year, edition, pages
2008. Vol. 43, no 3, 1094-1101 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-47044DOI: 10.1007/s10853-007-2249-7OAI: oai:DiVA.org:liu-47044DiVA: diva2:267940
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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