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Introducing Ta2O5 nanoparticles into Ca3Co4O9 matrix for increased thermoelectric property through phonon scattering

Ke Xu,H. Liu

Published 2020 in Ceramics International

ABSTRACT

Abstract Ta2O5 nanoparticles were synthesized by thermal decomposition of tantalum (V) ethoxide, and Ca3Co4O9/Ta2O5 composites were fabricated by ball milling. The volume percentage of Ta2O5 nanoparticles in the composites was controlled as 0, 2%, 4%, and 6% in four samples. The existence and dispersion of Ta2O5 nanoparticles in the composites were confirmed by electron microscopies. The Ca3Co4O9/Ta2O5 composite particles were hot-pressed into pellets and sintered for thermoelectric property measurement. The impacts of the Ta2O5 volume percentage on the lattice/electronic thermal conductivity, Seebeck coefficient, electrical conductivity, and thermoelectric Figure of Merit (ZT) of the Ca3Co4O9/Ta2O5 composites were investigated. The results indicated that an increased Ta2O5 volume percentage resulted in decreased electrical conductivity and thermal conductivity. When the Ta2O5 was 4 vol %, the highest Seebeck coefficient, and maximum ZT were observed in the Ca3Co4O9/Ta2O5 composite.

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