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Journal of Materials Science

, Volume 42, Issue 16, pp 6929–6934 | Cite as

Disordering and the electronic transport behaviors of NbC–Al4C3–C composite

  • D. Li
  • S. Ma
  • W. F. Li
  • B. Wu
  • Z. D. Zhang
Article

Abstract

A composite nanomaterial composed of NbC nanocrystals, Al4C3 nanorods and carbon nanofibers as well as amorphous carbon was fabricated by arc-discharging a Nb3Al block as an anode in CH4 gas. The growth process of the NbC–Al4C3–C composite was deduced according to the microstructures of its components and the experimental conditions. NbC nanocrystals with non-stoichiometric chemical composition were in a cubic shape. As the decomposition product of the precursor of CH4 gas, carbon nanofibers were thought to be as templates, reacting with Al atoms, to form Al4C3 nanorods with a diameter of 15–40 nm. A thin layer of aluminum carbide oxide covered the surface of Al4C3 nanorods. The temperature dependence of the resistivity for the NbC–Al4C3–C composite was described by the variable-range-hopping (VRH) model between about 100 K and 300 K because of the strong localization of electrons by disorder in the carbon matrix. Below 100 K, the transport behaviors of the pellet deviated from the VRH model due to the conduction competition between the semi-conducting carbon matrix and metallic NbC nanocrystals.

Keywords

High Resolution Transmission Electron Microscopy High Resolution Transmission Electron Microscopy Carbon Nanofibers Carbon Matrix Niobium Carbide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The work has been supported by National Natural Science Foundation of China under grant numbers No. 50332020 and No. 50171070.

References

  1. 1.
    Iijima S (1991) Nature 354:56CrossRefGoogle Scholar
  2. 2.
    Ebbesen TW, Ajayan PM (1992) Nature 358:220CrossRefGoogle Scholar
  3. 3.
    Huang MH, Mao S, Feick H, Yan HQ, Wu YY, Kind H, Weber E, Russo R, Yang PD (2001) Science 292:1897CrossRefGoogle Scholar
  4. 4.
    Hu J, Odom TW, Lieber CM (1999) Acc Chem Res 32:435CrossRefGoogle Scholar
  5. 5.
    Dekker C (1999) Phys Today 52:22CrossRefGoogle Scholar
  6. 6.
    Fukunaga A, Chu S, McHenry ME (1999) J Mater Sci Lett 18:431CrossRefGoogle Scholar
  7. 7.
    Fukunaga A, Chu SY, McHenry ME (1998) J Mater Res 13:2465CrossRefGoogle Scholar
  8. 8.
    Shi L, Gu YL, Chen LY, Yang ZH, Ma JH, Qian YT (2005) Carbon 43:211CrossRefGoogle Scholar
  9. 9.
    Wu HQ, Wei XW, Shao MW, Gu JS (2004) J Cryst Growth 265:184CrossRefGoogle Scholar
  10. 10.
    Wu HQ, Wei XW, Shao MW, Gu JS (2002) Chem Phys Lett 364:152CrossRefGoogle Scholar
  11. 11.
    Zhang HF, Dohnalkova AC, Wang CM, Young JS, Buck EC, Wang LS (2002) Nano Lett 2:105CrossRefGoogle Scholar
  12. 12.
    Li D, Li WF, Ma S, Zhang ZD (2006) Phys Rev B 73:193402CrossRefGoogle Scholar
  13. 13.
    Dong XL, Zhang ZD, Chuang YC, Jin SR (1999) Phys Rev B 60:3017CrossRefGoogle Scholar
  14. 14.
    Zhang ZD, Yu JL, Zheng JG, Skorvanek I, Kovac J, Dong XL, Li ZJ, Jin SR, Yang HC, Guo ZJ, Liu W, Zhao XG (2001) Phys Rev B 64:024404CrossRefGoogle Scholar
  15. 15.
    Pechen EV, Krasnosvobodtsev SI, Shabanova NP, Ekimov EV, Varlashkin AV, Nozdrin VS, Tschovrebov AM, Golovashkin AI (1994) Physics C 235–240:2511CrossRefGoogle Scholar
  16. 16.
    Storms EK (1967) The refractory carbides. Academic Press, New York, NY, p 65Google Scholar
  17. 17.
    Zhang ZX (1979) Handbook of physical constants. Beijing, Science Press, p 84 (in Chinese)Google Scholar
  18. 18.
    Geng DY, Zhang ZD, Zhang WS, Si PZ, Zhao XG, Liu W, Hu KY, Jin ZX, Song XP (2003) Scr Mater 48:593CrossRefGoogle Scholar
  19. 19.
    Woodford J, Chang YA (1998) Metall Mater Trans A 29:2717CrossRefGoogle Scholar
  20. 20.
    Cotton FA, Wilkinson G (1988) Advanced inorganic chemistry, 5th edn. Wiley, New YorkGoogle Scholar
  21. 21.
    Mott NF (1970) Phil Mag 22:7CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Shenyang National Laboratory for Materials ScienceInstitute of Metal Research and International Center for Materials Physics, Chinese Academy of SciencesShenyangP.R. China

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