Abstract
The effect of ytterbium doping on the low-temperature (<300 K) thermoelectric properties of Ca3-xYbxCo4O 9+δ (x=0.00, 0.02, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis and their properties measured from 25 K to 300 K. The X-ray diffraction patterns revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity and thermopower were increased and total thermal conductivity was decreased with an increase in ytterbium doping level. Among the doped samples, Ca2.95Yb0.05Co4O 9+δ had the highest dimensionless figure of merit of 0.037 at 300 K, representing an improvement of about 48% compared to the undoped Ca 3Co4O9+δ sample at the same temperature. These results indicate that the partial substitution of Yb3+ ion improves the thermoelectric properties of Ca3Co4O 9+δ.
| Original language | English |
|---|---|
| Pages (from-to) | 5937-5943 |
| Number of pages | 7 |
| Journal | Ceramics International |
| Volume | 40 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2014 May 1 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry
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Improvement on the low-temperature thermoelectric characteristics of Ca3-xYbxCo4O9+δ (0≤x≤0.10). / Bhaskar, Ankam; Huang, Y. C.; Liu, Chia Jyi.
In: Ceramics International, Vol. 40, No. 4, 01.05.2014, p. 5937-5943.Research output: Contribution to journal › Article
TY - JOUR
T1 - Improvement on the low-temperature thermoelectric characteristics of Ca3-xYbxCo4O9+δ (0≤x≤0.10)
AU - Bhaskar, Ankam
AU - Huang, Y. C.
AU - Liu, Chia Jyi
PY - 2014/5/1
Y1 - 2014/5/1
N2 - The effect of ytterbium doping on the low-temperature (<300 K) thermoelectric properties of Ca3-xYbxCo4O 9+δ (x=0.00, 0.02, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis and their properties measured from 25 K to 300 K. The X-ray diffraction patterns revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity and thermopower were increased and total thermal conductivity was decreased with an increase in ytterbium doping level. Among the doped samples, Ca2.95Yb0.05Co4O 9+δ had the highest dimensionless figure of merit of 0.037 at 300 K, representing an improvement of about 48% compared to the undoped Ca 3Co4O9+δ sample at the same temperature. These results indicate that the partial substitution of Yb3+ ion improves the thermoelectric properties of Ca3Co4O 9+δ.
AB - The effect of ytterbium doping on the low-temperature (<300 K) thermoelectric properties of Ca3-xYbxCo4O 9+δ (x=0.00, 0.02, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis and their properties measured from 25 K to 300 K. The X-ray diffraction patterns revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity and thermopower were increased and total thermal conductivity was decreased with an increase in ytterbium doping level. Among the doped samples, Ca2.95Yb0.05Co4O 9+δ had the highest dimensionless figure of merit of 0.037 at 300 K, representing an improvement of about 48% compared to the undoped Ca 3Co4O9+δ sample at the same temperature. These results indicate that the partial substitution of Yb3+ ion improves the thermoelectric properties of Ca3Co4O 9+δ.
UR - http://www.scopus.com/inward/record.url?scp=84895062475&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84895062475&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2013.11.040
DO - 10.1016/j.ceramint.2013.11.040
M3 - Article
AN - SCOPUS:84895062475
VL - 40
SP - 5937
EP - 5943
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 4
ER -