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首页> 外文期刊>Journal of Materials Science >Disordering and the electronic transport behaviors of NbC-Al4C3-C composite
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Disordering and the electronic transport behaviors of NbC-Al4C3-C composite

机译：NbC-Al4C3-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：通过在CH4气体中电弧放电Nb3Al块作为阳极，制备了由NbC纳米晶体，Al4C3纳米棒和碳纳米纤维以及无定形碳组成的复合纳米材料。根据其组成的微观结构和实验条件，推导了NbC-Al4C3-C复合材料的生长过程。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15-40 nm的Al4C3纳米棒。一薄层碳化铝氧化物覆盖了Al4C3纳米棒的表面。 NbC-Al4C3-C复合材料的电阻率与温度的关系通过可变距离跳跃（VRH）模型在约100 K和300 K之间进行描述，这是因为电子由于碳基体中的无序性而具有很强的局部性。在100 K以下，由于半导体碳基体和金属NbC纳米晶体之间的竞争，颗粒的运输行为偏离了VRH模型。

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