CPL - Chalmers Publication Library

Characterization and dielectric properties of beta-SiC nanofibres

Författare och institution:
Yiming Yao (Institutionen för material- och tillverkningsteknik); Anna Jänis (-); Uta Klement (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Publicerad i:
Journal of Materials Science, 43 s. 1094-1101
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2008
Språk:
engelska
Sammanfattning (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 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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
TEKNIK OCH TEKNOLOGIER ->
Materialteknik
Nyckelord:
SiC nanofibres, dielectric properties, TEM, SEM, EELS
Postens nummer:
67828
Ingår i post nr:
Posten skapad:
2008-01-28 13:04
Posten ändrad:
2008-02-08 17:05

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