The evolution of wide-temperature range (4.2–300 K) electron transport in niobium-carbon nanocomposites was studied at niobium concentration range 0.15–0.35. It was found that electron transport in the nanocomposites has the features of universality, expressed as two characteristic temperature intervals on the temperature dependences of conductivity. The crossover temperature between the intervals is in the range 20–30 K. Within each temperature interval, corrections to the conductivity are found to be as power-like ones. Power exponent p is characterized by the non-monotonic dependences on niobium concentration in the ranges 0.5–1.4 and 0.2–1.4 in the low- and high-temperature intervals with a minimum at 0.26 and 0.27 of Nb content. The satisfactory description of electron transport in niobium-carbon nanocomposites was achieved within the model of the inelastic tunneling of the electrons between the metal grains in the framework of the effective medium approximation.

在铌浓度范围为0.15-0.35的情况下，研究了铌碳纳米复合材料在宽温度范围（4.2-300 K）电子传输的演化。已经发现，纳米复合物中的电子传输具有普遍性的特征，以电导率的温度依赖性表示为两个特征温度区间。间隔之间的交叉温度在20-30 K范围内。在每个温度间隔内，发现电导率的校正像功率一样。幂指数p其特征是在低温和高温区间中铌浓度在0.5-1.4和0.2-1.4范围内的非单调依赖性，其最低Nb含量为0.26和0.27。在有效介质近似的框架内，在金属颗粒之间电子的非弹性隧穿模型中，实现了铌-碳纳米复合材料中电子传输的令人满意的描述。