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Title: High-temperature Thermoelectric Properties of Late Rare Earth-doped Ca3Co4O9+δ
Authors: Nong, N. V.;Liu, Chia-Jyi;Ohtaki, M.
Contributors: 物理學系
Keywords: Thermoelectric materials;Oxide materials;Solid state reactions;Thermoelectrics
Date: 2011-01
Issue Date: 2012-09-10T06:16:37Z
Publisher: Elsevier
Abstract: Misfit-layered oxides Ca3−xLnxCo4O9+δ with Ln = Dy, Er, Ho, and Lu were synthesized using solid state reactions. The resulting samples were hot-pressed (HP) at 1123 K in air for 2 h under a uniaxial pressure of 60 MPa. Thermoelectric properties of Ca3−xLnxCo4O9+δ were investigated up to 1200 K. Both the Seebeck coefficient and electrical resistivity increase upon Ln substitution for Ca. Among the Ln-doped samples, the magnitude of Seebeck coefficient tends to increase with decreasing ionic radius of Ln3+. The Ln-doped samples exhibit a lower thermal conductivity than the non-doped one due to a decrease of their lattice thermal conductivity. The dimensionless figure of merit, ZT, reaches 0.36 at 1073 K for the Ca2.8Lu0.2Co4O9+δ sample, which is about 1.6 times larger than that for the non-doped counterpart.
Relation: Journal of Alloys and Compounds, 509(3): 977-981
Appears in Collections:[Department of Physics] Periodical Articles

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