Preparation and Thermoelectric Properties of Bi Doped Ca3Co4O9 Based Thermoelectric Materials

Jing Wang; Qin Chen; Xia Chun Zhu; Seok Je Lee; Kyoung Woo Park; Chulg Yu Jhun

doi:10.4028/www.scientific.net/KEM.783.144

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 783Preparation and Thermoelectric Properties of Bi...

Preparation and Thermoelectric Properties of Bi Doped Ca₃Co₄O₉ Based Thermoelectric Materials

Abstract:

Polycrystalline Ca_3-xBi_xCo₄O₉samples have been prepared by solid-phase reaction followed by spark plasma sintering process. The thermoelectric properties have been systematically investigated from room temperature to near 1000K. It is found that the change of the carrier concentration leads to the change of resistivity, which is mainly associated with doping induced point defect phonon scattering. The change of the thermal potential mainly comes from the spin entropy. In addition, polycrystalline Ca_3-xBi_xCo₄O₉ had a maximum figure of merit of 0.30 at 973 K, which was about 50% higher than Ca₃Co₄O₉. It indicated that doping approach can effectively improve the thermoelectric performance of Ca₃Co₄O₉₊_δ-based material.

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Key Engineering Materials (Volume 783)

Pages:

144-147

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.783.144

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Online since:

October 2018

Authors:

Jing Wang, Qin Chen, Xia Chun Zhu, Seok Je Lee, Kyoung Woo Park, Chulg Yu Jhun*

Keywords:

Ca₃Co₄O₉, Solid-State Reaction, Spark Plasma Sintering, Thermoelectric Materials

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