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Characterization and dielectric properties of β-SiC nanofibres

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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.

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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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Authors and Affiliations

  1. Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, 412 96, Sweden

    Yiming Yao & Uta Klement

  2. Division of Sensor Systems, Swedish Defence Research Agency, Linkoping, 581 11, Sweden

    Anna Jänis

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  1. Yiming Yao
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  2. Anna Jänis
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Correspondence to Yiming Yao.

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Yao, Y., Jänis, A. & Klement, U. Characterization and dielectric properties of β-SiC nanofibres. J Mater Sci 43, 1094–1101 (2008). https://doi.org/10.1007/s10853-007-2249-7

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  • DOI: https://doi.org/10.1007/s10853-007-2249-7

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