Dou Y.K., Jin H.B.
Beijing Institute of Technology, CN
Keywords: nanopowder
Nanopowders of aluminum and nitrogen codoped β-silicon carbide (β-SiC) were successfully produced by self-propagating high-temperature synthesis in a nitrogen atmosphere. Characterizations by X-ray diffraction and scanning electron microscopy demonstrate the formation of Al-N codoped β-SiC nanopowders. In 1 MPa N2 atmosphere, the X-ray analysis of the produced powders suggests that Al and N are accommodated in the lattice of SiC, which enlarges with increasing amounts of Al. The electric permittivities of prepared powders have been determined in the frequency range of 8.2-12.4 GHz. They have been decreased by the Al and N co-doping compared to that of SiC with Al doping. But with the increasing the amounts of Al, the electric permittivities of the SiC nanopowders are increased again. The paper presents a method to adjust dielectric property of SiC powders in the GHz range. These features confer Al-N codoped β-SiC qualifications of the important microwave absorbing material.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Pages: 306 - 309
Industry sector: Advanced Materials & Manufacturing
Topic: Carbon Nano Structures & Devices
ISBN: 978-1-4665-6274-5