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采用助溶剂法合成Ca_3Co_(3.9)Cu_(0.1)O_9粉体,与Bi_2O_3混合压制、烧结,制备出Ca_3Co_(3.9)Cu_(0.1)O_9/Bi_2Ca_2Co_2O_y复合材料,通过改变Bi_2O_3的加入量,研究其对复合材料热电性能的影响。结果表明:Bi_2O_3的加入能够提高样品的致密度;随着Bi_2O_3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,Ca_3Co_(3.9)Cu_(0.1)O_9(Bi_2O_3)0.2样品具有最大功率因子,达到3.27×10-4Wm-1K-2。
The composite of Ca_3Co_ (3.9) Cu_ (0.1) O_9 / Bi_2Ca_2Co_2O_y was prepared by mixing cosolvent with Ca_3Co_ (3.9) Cu_ (0.1) O_9 powder and mixing with Bi_2O_3. Effect of Thermoelectric Properties of Composites. The results show that the addition of Bi_2O_3 can increase the density of the sample. With the increase of Bi_2O_3 addition, the resistivity of the sample decreases obviously, the Seebeck coefficient changes little and the power factor increases obviously. Under the temperature of 973 K, ) Cu_ (0.1) O_9 (Bi_2O_3) 0.2 samples have the maximum power factor of 3.27 × 10-4Wm-1K-2.