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Journal of Materials Science

, Volume 43, Issue 3, pp 1094–1101 | Cite as

Characterization and dielectric properties of β-SiC nanofibres

  • Yiming Yao
  • Anna Jänis
  • Uta Klement
Article

Abstract

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 β-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.

Keywords

Dielectric Loss Loss Tangent Relative Permittivity Crystalline Core Permittivity Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We would like to thank the Swedish Defence Nanotechnology Program for the financial support, and University Claude Bernard, Laboratoire des Multimatériaux et Interfaces (LMI) in Lyon, France, for the supply of the materials. We would also like to thank Jan Fagerström (Swedish Defence Research Agency) for helpful discussions.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Materials and Manufacturing TechnologyChalmers University of TechnologyGothenburgSweden
  2. 2.Division of Sensor SystemsSwedish Defence Research AgencyLinkopingSweden

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