摘要
采用助溶剂法和固相反应法分别合成Ca_(3-x)La_xCo_(3.9)Cu_(0.1)O_(9+δ)(0≤x≤0.16)和Bi_2Ca_2Co_(1.9)Cu_(0.1)O_y陶瓷粉体,通过热压烧结制备Ca_(3–x)La_xCo_(3.9)Cu_(0.1)O_(9+δ)/Bi_2Ca_2Co_(1.9)Cu_(0.1)O_y复合热电材料,研究了La掺杂对复合热电材料的微观结构、物相组成和热电性能的影响。结果表明:La掺杂复合热电材料的XRD谱与标准JCPDS卡保持一致,没有引进新的杂质;La掺杂样品的电导率和Seebeck系数同时增加,功率因子得到显著提高。在973 K时,Ca_(2.92)La_(0.08)Co_(3.9)Cu_(0.1)O_(9+δ)/Bi_2Ca_2Co_(1.9)Cu_(0.1)O_y样品的功率因子达到4.477×10^(–4 )W·m^(–1)·K^(–2)。
Ca3–xLaxCo3.9Cu0.1O9＋δ （0≤x≤0.16） and Bi2Ca2Co1.9Cu0.1Oy powders were synthesized by the methods of molten salt reaction and solid phase reaction, respectively. The Ca3–xLaxCo3.9Cu0.1O9＋δ /Bi2Ca2Co1.9Cu0.1Oy thermoelectric composites were prepared by hot pressing sintering. The effects of La doping on the microstructure, phase composition and the thermoelectric properties of the composites were studied. The results show that the XRD patterns of La-doped thermoelectric composites are consistent with the standard JCPDS patterns, and no impurities are found. The partial substitution of La at Ca-site induces a simultaneous increase in the electrical conductivity and Seebeck coefficient. At 973 K, the maximum of the power factor of the thermoelectric composites Ca3-xLaxCo3.9Cu0.1O9＋δ/Bi2Ca2Co1.9Cu0.1Oy is obtained when x =0.08, about 4.477×10^–4 W·m^–1·K^–2.
出处
《电子元件与材料》
CAS
CSCD
2017年第11期27-32,共6页
Electronic Components And Materials
基金
西华大学研究生创新基金项目(No.ycjj2016042)
