Ca3Co3.9Cu0.1O9/Bi2Ca2Co2Oy复合材料的热电性能

Ca₃Co_3.9Cu_0.1O₉/Bi₂Ca₂Co₂O_y复合材料的热电性能

摘要: 采用助溶剂法合成Ca₃Co_3.9Cu_0.1O₉粉体，与Bi₂O₃混合压制、烧结，制备出Ca₃Co_3.9Cu_0.1O₉/Bi₂Ca₂Co₂O_y复合材料，通过改变Bi₂O₃的加入量，研究其对复合材料热电性能的影响。结果表明：Bi₂O₃的加入能够提高样品的致密度；随着Bi₂O₃加入量的增加，样品的电阻率明显降低，Seebeck系数变化不大，功率因子显著增大；在973 K的温度下，Ca₃Co_3.9Cu_0.1O₉ (Bi₂O₃)_0.2样品具有最大功率因子，达到3.27×10^-4 Wm^-1K^-2。

Abstract: The Ca₃Co_3.9Cu_0.1O₉ powder synthesized by solvent method was sintered with various Bi₂O₃ for Ca₃Co_3.9Cu_0.1O₉/Bi₂Ca₂Co₂O_y composites in this article, and the effects of Bi₂O₃ addition on the thermoelectric properties of the composite were studied. The study shows that the addition of Bi₂O₃ can get denser samples, and with the Bi₂O₃ increasing, the electrical resistivity decreases sharply while Seebeck coefficient changs little and this results in a maximum power factor of 3.27×10^-4 Wm^-1K^-2 in Ca₃Co_3.9Cu_0.1O₉ (Bi₂O₃)_0.2 sample at 973 K.