(Ca_0.87Ag_0.1La_0.03)₃Co₄O₉ ceramics along [00l]_c crystallographic orientation were prepared by using tape casting combined with template grain growth method, which were regulated bywhich the sintering temperature and the soaking time. The (La, Ag) co-doping not only can balance the contradiction of the electrical resistivity and Seebeck coefficient, but also generat the point-defects to increase phonon scattering, which can lower thermal conductivity. The effect of grain orientation evolution on thermoelectric properties was investigated and the mechanism of epitaxial growth was discussed through the analysis of microstructures. The results show that the optimized sintering parameters led to great changes in the degree of texturing, which was closely related to thermoelectric performance. A large Seebeck coefficient of 232 μV/K was obtained for the 40 h sample and the high Lotgering factor of 92.7% for the 20 h sample reached, giving rise to the power factor of 0.38 mW/(m·K²) at 1073 K. The morphologic orientation and epitaxial growth give a possible route of preparing highly textured ceramics and achieving high thermoelectric properties.

（Ca _0.87 Ag _0.1 La _0.03）沿[00 l ] _c的3 Co ₄ O ₉陶瓷采用流延流延结合模板晶粒长大法制备了结晶取向，并通过烧结温度和保温时间对其进行调节。（La，Ag）共掺杂不仅可以平衡电阻率和塞贝克系数之间的矛盾，而且可以产生点缺陷以增加声子的散射，从而降低热导率。研究了晶粒取向演变对热电性能的影响，并通过微观组织分析探讨了外延生长的机理。结果表明，优化的烧结参数导致织构度的巨大变化，这与热电性能密切相关。²）在1073K。形态取向和外延生长为制备高织构陶瓷和实现高热电性能提供了可能的途径。