dc.contributor.author |
KIirat, G |
|
dc.contributor.author |
Aksan, MA |
|
dc.contributor.author |
Rasekh, S |
|
dc.contributor.author |
Madre, MA |
|
dc.contributor.author |
Diez, JC |
|
dc.contributor.author |
Sotelo, A |
|
dc.date.accessioned |
2022-10-13T11:46:17Z |
|
dc.date.available |
2022-10-13T11:46:17Z |
|
dc.date.issued |
2015 |
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dc.identifier.uri |
http://hdl.handle.net/11616/79462 |
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dc.description.abstract |
In this study, the effect of Yb-substitution on the structural, electrical and thermal transport properties of the Ca3Co4O9+delta system has been investigated in the low temperature region (between 10 and 300 K). The resistivity of samples increases with raising the Yb-concentration in the system. All the samples show a metal-semiconductor transition below 85 K. In the analysis based on Strongly Correlated Fermi Liquid Model, an increased bandwidth and a reduced electronic correlation are found. It has also been found that the energy gap, E-0, value also decreases with Yb-substitution. The samples show positive thermoelectric power, indicating that dominant charge carriers are holes in all the samples. The thermoelectric power value decreases with Yb-substitution. From Mott equation, it is determined that the Fermi energy and hole concentration decrease in the Yb-susbtituted samples, compared to the undoped ones. Thermal conductivity, kappa, is decreased in about 50% of the measured in undoped samples for the 0.01 and 0.03 Yb-doped samples at 300 K. Highest figure of merit, ZT, value is found to be 5.4 10(-3) at 300 K for the unsubstituted sample and the ZT value decreases by the substitution. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
|
dc.description.abstract |
C1 [KIirat, G.; Aksan, M. A.] Inonu Univ, Fen Edebiyat Fak, TR-44280 Malatya, Turkey. |
|
dc.description.abstract |
[Rasekh, Sh.; Madre, M. A.; Diez, J. C.; Sotelo, A.] ICMA CSIC Univ Zaragoza, Zaragoza 50018, Spain. |
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dc.source |
CERAMICS INTERNATIONAL |
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dc.title |
Decrease of Ca3Co4O9+delta thermal conductivity by Yb-doping |
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