A series of xBaTiO₃/Bi_0.5Sb_1.5Te₃ (xBTO/BST) nanocomposite thermoelectric materials were prepared by the method of ultrasonic dispersion combined spark plasma sintering. The thermoelectric performance was systematically investigated in the temperature range from 300 K to 500 K. Combined with the analysis of phase composition and microstructure, the results indicated that the BTO nanoparticles were uniformly dispersed in the grain boundaries of the BST matrix, which can optimize carrier concentration and produce an energy filtering effect to a certain extent to improve the Seebeck coefficient, and also reduced the thermal conductivity. The highest ZT value of the sample with x = 0.2% was achieved 1.2 at 340 K, which was 20% larger than that of the matrix. This work is helpful for exploring new composite systems to improve the thermoelectric performance of composites.

采用超声分散结合火花等离子体烧结的方法，制备了一系列x BaTiO ₃ / Bi _0.5 Sb _1.5 Te ₃（x BTO / BST）纳米复合热电材料。在300 K至500 K的温度范围内系统地研究了热电性能。结合相组成和微观结构分析，结果表明BTO纳米粒子均匀地分散在BST基体的晶界中，可以优化载体。集中并产生一定程度的能量过滤效果，以提高塞贝克系数，同时也降低了热导率。最高ZTx  = 0.2％的样品的值在340 K下达到1.2，比基质大20％。这项工作有助于探索新的复合材料系统，以改善复合材料的热电性能。