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High-temperature thermoelectric properties of W-substituted CaMnO3

Published online by Cambridge University Press:  01 February 2013

Dimas S. Alfaruq ,
James Eilertsen ,
Philipp Thiel ,
Myriam H Aguirre ,
Eugenio Otal ,
Sascha Populoh ,
Songhak Yoon  and
Anke Weidenkaff
Dimas S. Alfaruq
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
James Eilertsen
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Philipp Thiel
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Myriam H Aguirre
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Eugenio Otal
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Sascha Populoh
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Songhak Yoon
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
Anke Weidenkaff*
Affiliation:
Empa, Solid State Chemistry and Catalysis, Ueberlandstrasse. 129, CH-8600 Duebendorf, Switzerland
*
*Corresponding Author: [email protected]
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Abstract

The thermoelectric properties of W-substituted CaMn1-xWxO3-δ (x = 0.01, 0.03; 0.05) samples, prepared by soft chemistry, were investigated from 300 K to 1000 K and compared to Nb-substituted CaMn0.98Nb0.02O3-δ. All compositions exhibit both an increase in absolute Seebeck coefficient and electrical resistivity with temperature. Moreover, compared to the Nb-substituted sample, the thermal conductivity of the W-substituted samples was strongly reduced. This reduction is attributed to the nearly two times greater mass of tungsten. Consequently, a ZT of 0.19 was found in CaMn0.97W0.03O3-δ at 1000 K, which was larger than ZT exhibited by the 2% Nb-doped sample.

Keywords

thermoelectricityoxidex-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 3 - 8
Copyright
Copyright © Materials Research Society 2013 

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