Research on Properties of Ca_3-x La _xCo₄O₉ Thermoelectric Material with Adding La

Abstract:

Ca₃Co₄O₉ and Ca_3-xLa_xCo₄O9 powders were prepared by sol-gel process. The Ca-Co-O thermoelectric material ceramics were prepared. The ceramics materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microstructure and thermoelectric properties of ceramics were researched. The results indicate that the crystal of Ca_3-xLa_xCo₄O₉ with La adding growth ideally, the material had high density and low pore rate. The Ca_3-xLa_xCo₄O₉ ceramics contain directional array plate-shaped grains with layered structure. The thermoelectric properties of Ca_3-xLa_xCo₄O ceramics were excellent. There were high Seebeck coefficient and high electrical conductivity for Ca_3-xLa_xCo₄O₉ ceramics. The power factor increased with temperature increasing.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 613-617
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.613
• Online since: July 2011
• Authors: Li Peng Zhang, Xian Jin Yu, Zhi Wei Ge, Yun Hui Dong, Dang Gang Li
• Keywords: Ca_3-xLa_xCo₄O₉, Microstructure, Sol-Gel (SG), Thermoelectric Properties

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