Abstract
Misfit-layered oxides Ca3-xLnxCo4O 9+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.
| Original language | English |
|---|---|
| Pages (from-to) | 977-981 |
| Number of pages | 5 |
| Journal | Journal of Alloys and Compounds |
| Volume | 509 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jan 21 2011 |
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All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Mechanics of Materials
- Materials Chemistry
- Metals and Alloys
Cite this
High-temperature thermoelectric properties of late rare earth-doped Ca 3Co4O9+δ . / Nong, N. V.; Liu, Chia Jyi; Ohtaki, Michitaka.
In: Journal of Alloys and Compounds, Vol. 509, No. 3, 21.01.2011, p. 977-981.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High-temperature thermoelectric properties of late rare earth-doped Ca 3Co4O9+δ
AU - Nong, N. V.
AU - Liu, Chia Jyi
AU - Ohtaki, Michitaka
PY - 2011/1/21
Y1 - 2011/1/21
N2 - Misfit-layered oxides Ca3-xLnxCo4O 9+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.
AB - Misfit-layered oxides Ca3-xLnxCo4O 9+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.
UR - http://www.scopus.com/inward/record.url?scp=78449262461&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78449262461&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2010.09.150
DO - 10.1016/j.jallcom.2010.09.150
M3 - Article
AN - SCOPUS:78449262461
VL - 509
SP - 977
EP - 981
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 3
ER -