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本文采用自蔓延法与固相反应相结合的方法,以Na2CO3、CaCO3、Co(NO3)2.6H2O、CuO、HNO3为原料,去离子水为溶剂,柠檬酸为螯合剂,制备了Na1.7-xCax(Co0.85Cu0.15)2O4(0≤x≤0.20)粉体。对制备的粉末XRD以及烧结试样的SEM进行分析。结果表明随着Ca2+掺杂量的增加,粉末中会生成一些其他的物相,烧结体的晶粒也逐渐变大,但烧结体的结构仍以层状结构为主。在温度373～873K下,对烧结体进行热电性能的测试,烧结体试样的电导率与Seebeck系数均有较大幅度的提高。其中Na1.55Ca0.15(Co0.85Cu0.15)2O4的烧结体在873K时功率因子达到最大值为9.45×10-4 W/mK2。
In this paper, self-propagating method and solid-phase reaction combined with the method of Na2CO3, CaCO3, Co (NO3) 2.6H2O, CuO, HNO3 as raw material, deionized water as the solvent, citric acid chelator, prepared Na1.7- xCax (Co0.85Cu0.15) 2O4 (0≤x≤0.20) powder. The prepared powder XRD and the SEM of the sintered sample were analyzed. The results show that with the increase of Ca2 + content, some other phases will be formed in the powder, and the grain size of the sintered body will also gradually increase. However, the structure of the sintered body is still dominated by the layered structure. Under the temperature of 373 ~ 873K, the thermoelectric properties of the sintered body tested, the electrical conductivity of the sintered body specimen and the Seebeck coefficient have a more substantial increase. The maximum power factor of Na1.55Ca0.15 (Co0.85Cu0.15) 2O4 sintered at 873K reached 9.45 × 10-4 W / mK2.