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Synthesis of Na_xCo_2O_4 thermoelectric oxide with crystallographic anisotropy by chemical solution process

机译：化学溶液法合成具有晶体学各向异性的Na_xCo_2O_4热电氧化物

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摘要

The synthesis of the Na_xCo_2O_4 with a layered crystal structure was attempted by using the polymerized complex (PC) method or citric acid complex (CAC) method, both of which are a kind of chemical solution process. The effects of these chemical solution processes on the crystallographic anisotropy, microstructure and thermoelectric properties of the sintered Na_xCo_2O_4 were investigated and compared to those of the conventional SSR method. In the case of the PC method, the sintered body with higher chemical homogeneity and finer microstructure than those of the SSR sample was obtained, resulting in the high thermoelectric performance. However, the crystallographic orientation was almost the same as that of the SSR sample. On the other hand, in the case of the CAC method, a flaky powder precursor was formed by grain growth of the Na_xCo_2O_4 phase along the c-plane. The Na_xCo_2O_4 sample sintered from this powder precursor showed a high crystallographic anisotropy and good chemical homogeneity, so the CAC process was found to be quite effective for synthesizing a crystallographically oriented Na_xCo_2O_4 polycrystal with high thermoelectric performance.
机译：尝试通过聚合络合物（PC）法或柠檬酸络合物（CAC）法合成具有层状晶体结构的Na_xCo_2O_4，两者均为化学溶液法。研究了这些化学溶液处理对烧结的Na_xCo_2O_4的晶体各向异性，微观结构和热电性能的影响，并将其与常规SSR方法的影响进行了比较。在PC法的情况下，获得了比SSR样品具有更高的化学均一性和更好的微观结构的烧结体，从而具有高的热电性能。但是，晶体学取向与SSR样品几乎相同。另一方面，在CAC法的情况下，通过沿着c面的Na_xCo_2O_4相的晶粒生长而形成片状粉末前体。由该粉末前体烧结的Na_xCo_2O_4样品显示出高的结晶各向异性和良好的化学均质性，因此发现CAC工艺对于合成具有高热电性能的结晶取向的Na_xCo_2O_4多晶体非常有效。

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