【摘要】 采用机械合金化方法制备N型赝三元半导体热电材料，经500℃高温烧结后，与纳米Al₂O₃粉体充分混合，在200℃下热压成型得到N型Al₂O₃-（Bi₂Te₃）_0.9（Sb₂Te₃）_0.05（Sb₂Se₃）_0.05复合块体热电材料.微观结构分析和热电性能测试结果表明，高温烧结后材料的结晶度变高；随Al₂O₃掺杂浓度的增高，材料的电导率和热导率逐渐减小，而Seebeck系数几乎不变.在Al₂O₃掺杂浓度为0.5 wt%时，热电优值达到2.05×10^-3 K^-1.更多还原

【Abstract】 In this paper, N-type pseudo-ternary semiconductor thermoelectric materials were prepared by mechanical alloying method. N-type Al₂O₃-（Bi₂Te₃）_0.9（Sb₂Te₃）_0.05（Sb₂Se₃）_0.05 composite block thermoelectric materials were obtained after being sintered at a high temperature of 500 ℃ and fully mixed with nano Al₂O₃ powder and hot-pressed at 200 ℃. Microstructure analysis and thermoelectric properties test results show that the crystallinity of the materials becomes higher after high temperature sintering. With the increase of Al₂O₃ doping concentration, the electrical conductivity and thermal conductivity of the material gradually decrease, while the Seebeck coefficient is almost unchanged. When Al₂O₃ doping concentration is 0.5 wt%, the thermoelectric optimum value reaches 2.05×10^-3 K^-1.更多还原