Characterization and dielectric properties of beta-SiC nanofibres
Journal article, 2008

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 beta-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.

TEM

SiC nanofibres

SEM

dielectric properties

EELS

Author

Yiming Yao

Chalmers, Materials and Manufacturing Technology, Materials Technology

Anna Jänis

Swedish Defence Research Agency (FOI)

Uta Klement

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Journal of Materials Science

0022-2461 (ISSN) 1573-4803 (eISSN)

Vol. 43 3 1094-1101

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Materials Science

Subject Categories

Materials Engineering

DOI

10.1007/s10853-007-2249-7

More information

Latest update

2/27/2018