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

机译：NbC–Al4 C3 –C复合材料的无序和电子输运行为

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摘要

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.
机译：通过将Nb3 Al嵌段作为阳极在CH4中电弧放电，制备了由NbC纳米晶体，Al4 C3 纳米棒，碳纳米纤维以及无定形碳组成的复合纳米材料。加油站。根据NbC–Al4 C3 -C复合材料的微观结构和实验条件，推导了其生长过程。具有非化学计量化学组成的NbC纳米晶体呈立方体形状。作为CH4 气体前体的分解产物，碳纳米纤维被认为是模板，与Al原子反应形成直径为15–40 nm的Al4 C3 纳米棒。 。一薄层碳化铝覆盖了Al4 C3 纳米棒的表面。 NbC–Al4 C3 –C复合材料的电阻率的温度依赖性通过电子的强定位性在大约100 K和300 K之间的可变范围跳跃（VRH）模型来描述碳基质中的无序。在100 K以下，由于半导体碳基体和金属NbC纳米晶体之间的传导竞争，颗粒的传输行为偏离了VRH模型。

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  • 来源
    《Journal of Materials Science》 |2007年第16期|6929-6934|共6页
  • 作者

    D. Li; S. Ma; W. F. Li; B. Wu; Z. D. Zhang;

  • 作者单位

    Shenyang National Laboratory for Materials Science Institute of Metal Research and International Center for Materials Physics Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research and International Center for Materials Physics Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research and International Center for Materials Physics Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research and International Center for Materials Physics Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research and International Center for Materials Physics Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China;

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