トンネル空間にナトリウムを含むジントルスズ化合物の合成と熱電特性

抄録

  Tin-based Zintl compounds with a crystal structure containing guest atoms of Na in tunnel space were synthesized, and their thermal and electrical properties were characterized in order to develop innovative thermoelectric materials. Experiments and calculations revealed that the compounds with rattling Na atoms in the tunnel space exhibit extremely low thermal conductivity and high thermoelectric properties and that the lattice thermal conductivity decreases with decreasing Na–Na interatomic distance. This clarified the mechanism by which the closeness of the rattling Na atoms increases the anharmonicity of phonons responsible for heat conduction, resulting in lower lattice thermal conductivity.