High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+

Nong Ngo Van; Chia-Jyi Liu; M. Ohtaki

doi:10.1016/j.jallcom.2010.09.150

High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+

Nong Ngo Van, Chia-Jyi Liu, M. Ohtaki

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Abstract

Misfit-layered oxides Ca3−xLnxCo4O9+ with Ln = Dy, Er, Ho, and Lu were synthesized using solid state reactions. The resulting samples were hot-pressed (HP) at 1123K in air for 2 h under a uniaxial pressure of 60 MPa. Thermoelectric properties of Ca3−xLnxCo4O9+ı 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 1073K for the Ca2.8Lu0.2Co4O9+ sample, which is about 1.6 times larger than that for the non-doped counterpart.
Keyword: Thermoelectric materials; Oxide materials; Solid state reactions; Thermoelectrics

Original language	English
Journal	Journal of Alloys and Compounds
Volume	509
Pages (from-to)	977-981
ISSN	0925-8388
DOIs	https://doi.org/10.1016/j.jallcom.2010.09.150
Publication status	Published - 2011
Externally published	Yes

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@article{3379c65fd5324560914211df504053c3,

title = "High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+",

abstract = "Misfit-layered oxides Ca3−xLnxCo4O9+ with Ln = Dy, Er, Ho, and Lu were synthesized using solid state reactions. The resulting samples were hot-pressed (HP) at 1123K in air for 2 h under a uniaxial pressure of 60 MPa. Thermoelectric properties of Ca3−xLnxCo4O9+ı 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 1073K for the Ca2.8Lu0.2Co4O9+ sample, which is about 1.6 times larger than that for the non-doped counterpart. Keyword: Thermoelectric materials; Oxide materials; Solid state reactions; Thermoelectrics",

author = "{Ngo Van}, Nong and Chia-Jyi Liu and M. Ohtaki",

year = "2011",

doi = "10.1016/j.jallcom.2010.09.150",

language = "English",

volume = "509",

pages = "977--981",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier",

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TY - JOUR

T1 - High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+

AU - Ngo Van, Nong

AU - Liu, Chia-Jyi

AU - Ohtaki, M.

PY - 2011

Y1 - 2011

N2 - Misfit-layered oxides Ca3−xLnxCo4O9+ with Ln = Dy, Er, Ho, and Lu were synthesized using solid state reactions. The resulting samples were hot-pressed (HP) at 1123K in air for 2 h under a uniaxial pressure of 60 MPa. Thermoelectric properties of Ca3−xLnxCo4O9+ı 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 1073K for the Ca2.8Lu0.2Co4O9+ sample, which is about 1.6 times larger than that for the non-doped counterpart. Keyword: Thermoelectric materials; Oxide materials; Solid state reactions; Thermoelectrics

AB - Misfit-layered oxides Ca3−xLnxCo4O9+ with Ln = Dy, Er, Ho, and Lu were synthesized using solid state reactions. The resulting samples were hot-pressed (HP) at 1123K in air for 2 h under a uniaxial pressure of 60 MPa. Thermoelectric properties of Ca3−xLnxCo4O9+ı 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 1073K for the Ca2.8Lu0.2Co4O9+ sample, which is about 1.6 times larger than that for the non-doped counterpart. Keyword: Thermoelectric materials; Oxide materials; Solid state reactions; Thermoelectrics

U2 - 10.1016/j.jallcom.2010.09.150

DO - 10.1016/j.jallcom.2010.09.150

M3 - Journal article

SN - 0925-8388

VL - 509

SP - 977

EP - 981

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

High-temperature thermoelectric properties of late rare earth-doped Ca3Co4O9+

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