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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 71-78Thermal Transport Properties of Ca3Co4O9 with Mg...

Thermal Transport Properties of Ca₃Co₄O₉with Mg Substitution

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Abstract:

Polycrystalline Ca_3-xMg_xCo₄O₉（x=0-0.3）ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermal conductivities were measured from room temperature to 673 K. The influence of Mg²⁺ substitution for Ca²⁺ on the thermal conductivities of Ca₃Co₄O₉ ceramics was investigated systematically. The influence of Mg doping on the thermal conductivities is mainly embodied in the lattice thermal conductivities, which shows a significant decrease with the increase of the dopant content for the samples with x ≤ 0.2, while the carrier thermal conductivity had no obvious change with Mg doping increasing. These results indicated that the thermal conductivities of the material could be reduced remarkably with the substitution of Mg from 1.427 W/m·K to 0.731 W/m·K at 573 K with x = 0.2.

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Periodical:

Applied Mechanics and Materials (Volumes 71-78)

Pages:

959-962

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.71-78.959

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Cite this paper

Online since:

July 2011

Authors:

Xiao Ling Qi, Ling Ke Zeng, You Yu Fan

Keywords:

Cobaltite Ceramic, Substitution, Thermal Conductivity (TC), Thermal Property

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