単体金属混合粉を用い作製したp型 (Bi₂Te₃)_0.25(Sb₂Te₃)_0.75熱電材料の微細構造と熱電特性の関係

抄録

Semiconducting ceramics of p-type bismuth telluride by hot pressing the milled powders of (Bi₂Te₃)_0.25(Sb₂Te₃)_0.75 particle size of 1.9μm and 0.29mass% impurity oxygen was fabricated. These ceramics showed a maximum figure of merit of 2.4×10^-3K^-1 at 25°C when the grain size was 5μm because their thermal conductivity apparently became the lowest possibly due to enhanced phonon scattering at grain boundaries. Their thermoelectric properties did not exhibit anisotropy due to their isotropic microstructure with no grain orientation.