金属热导率的第一性原理计算方法在铝中的应用

Thermal conductivity of metal from first principles calculations and its application in aluminum

热导率是金属材料的一个基本物理性质,金属材料热导率的计算对理解和设计新型热电材料具有重要的理论意义。由于金属的热导率由声子热导率和电子热导率两部分组成,本文从第一性原理计算出发,并以金属铝为例,计算了铝的声子谱和电子能带结构,并结合徳拜模型、形变势模型和Drude自由电子气模型,分别计算获得金属铝在300 K下的声子热导率和电子热导率为4.8 W/m K和186.1 W/m K,该计算值与实验值较吻合。该研究为预测和设计新的热电材料提供理论支持。

Thermal conductivity is a basic physical property of metal materials. The calculation of thermal conductivity of metallic materials has great theoretical significance for understanding and designing new thermoelectric materials.Since the thermal conduc-tivity of metal is composed of two parts, the phonon thermal conductivity and the electronic thermal conductivity, the phonon spectra and electron energy band structures of the metal Al are calculated by the first principles calculation combined with the Debye mod-el, deformation potential model and the Drude free electron gas model. The calculated phonon thermal conductivity and electronic thermal conductivity are 4.8 W/mK and 186.1 W/mK at 300 K, which are in good agreement with the experimental values.The study provides theoretical support for predicting and designing new thermoelectric materials.