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 08.11.2010   Карта сайта     Language По-русски По-английски
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08.11.2010


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Dielectric response of carbon coated TiC nanocubes at 2–18 GHz frequencies





H. Menga, K.P. Songa, H. Wanga, J.J. Jianga, D. Lia, E-mail The Corresponding Author, Z. HanCorresponding Author Contact Information, a, E-mail The Corresponding Author and Z.D. Zhanga






a Shenyang National Laboratory for Material Science, Institute of Metal Research, and International Centre for Material Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China





Received 4 August 2010; 


revised 8 September 2010; 


accepted 9 September 2010. 


Available online 22 September 2010.









Abstract



Microwave frequency (2–18 GHz) dielectric response has been investigated in the carbon-coated cubic TiC nanoparticles embedded in paraffin matrix with different weight fractions. DC conductivity measurements showed that the TiC nanocubes/paraffin composites have a percolation threshold of about 30 wt%. Absorption property was found to be improved with increasing mass ratio in the present system, up to a mass ratio of 50 wt%. Reflection loss exceeding −20 dB in the frequency range of 6–16 GHz, with layer thicknesses from 2 to 4 mm, was found in the 50 wt% loaded sample. TiC nanocube/paraffin composite with a proper mass ratio can be very good prospective microwave absorption agent.









Research highlights



right triangle, filled A novel cubic TiC nanocrystals encapsulated in cubic carbon cages have been synthesized by arc-discharge. Nanocapsules are commonly reported to have spherical forms, and very few investigations have been done on the cubic core–shell structured nanocomposite. right triangle, filled DC conductivity for the TiC nanocubes/paraffin composites are measured with a standard four-point method using the Keithley 2400 SourceMeter. Percolation threshold of about 30 wt% was found in the present system. right triangle, filled TiC nanocubes/paraffin composites are found to show increasing RL peak values with increasing mass ratios, without maximum around the percolation threshold. right triangle, filled Reflection loss is calculated to be exceeding −20 dB in the frequency range of 6–16 GHz, with layer thicknesses from 2 to 4 mm, in the 50 wt% loaded sample. Carbon coated TiC nanocubes seems to be very good candidate for anti-reflective microwave absorption coating materials.





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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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