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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Effect of Bi Substitution on Microstructure and Thermoelectric Properties of Polycrystalline [Ca_2CoO_3]_pCoO_2
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Effect of Bi Substitution on Microstructure and Thermoelectric Properties of Polycrystalline [Ca_2CoO_3]_pCoO_2

机译：Bi取代对多晶[Ca_2CoO_3] _pCoO_2的组织和热电性能的影响

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摘要

Partially Bi-substituted [Ca_2CoO_3]_pCoO_2 ceramics were synthesized using a hot-forging technique. Then, the effects of Bi-substitution on microstructure and thermoelectric properties were evaluated. The average grain size of the precursor powder prepared by a solid-state reaction increased concomitant with the increase in Bi content. Furthermore, the electrical resistivity (ρ) of the hot-forged sample was decreased accordingly. Seebeck coefficient (S) was increased slightly by Bi-substitution and was less affected by grain size. Therefore, power factor (PF = S~2/ρ) was improved. On the other hand, the ρ of the hot-forged sample was reduced using a large-grained precursor powder prepared by a solution growth method. Different from the case of the former samples made from as-sintered powder, the ρ of the sample made from large-grained powder was increased slightly with the increase in Bi content. These results indicate that the main advantage of Bi-substitution for the decrease in the ρ of the hot-forged sample is the enhanced grain growth during the heat treatment processes.
机译：采用热锻技术合成了部分双取代的[Ca_2CoO_3] _pCoO_2陶瓷。然后，评估了Bi取代对组织和热电性能的影响。通过固相反应制备的前体粉末的平均粒径随着Bi含量的增加而增加。此外，热锻样品的电阻率（ρ）相应降低。 Seebeck系数（S）通过Bi替代而略有增加，并且受晶粒尺寸的影响较小。因此，功率因数（PF = S〜2 /ρ）得到改善。另一方面，使用通过溶液生长法制备的大颗粒前体粉末降低了热锻样品的ρ。与以前的烧结粉末样品不同，大颗粒粉末样品的ρ随着Bi含量的增加而略有增加。这些结果表明，Bi替代对于降低热锻样品ρ的主要优势是在热处理过程中晶粒的生长得以增强。

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