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Thermoelectric properties of Ru and In substituted misfit-layered Ca3Co4O9

Published online by Cambridge University Press:  14 August 2013

Gesine Saucke ,
Sascha Populoh ,
Nina Vogel-Schäuble ,
Leyre Sagarna ,
Kailash Mogare ,
Lassi Karvonen  and
Anke Weidenkaff
Gesine Saucke
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland
Sascha Populoh
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland
Nina Vogel-Schäuble
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland
Leyre Sagarna
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland
Kailash Mogare
Affiliation:
University of Berne, Department of Chemistry and Biochemistry, CH-3012 Berne, Switzerland
Lassi Karvonen
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland
Anke Weidenkaff
Affiliation:
Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Überlandstr. 129, CH-8600 Dübendorf, Switzerland University of Berne, Department of Chemistry and Biochemistry, CH-3012 Berne, Switzerland
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Abstract

As an approach to improve the thermoelectric properties of the polycrystalline Ca3Co4O9 misfit-layered oxide, substitutions of Co2+…4+ with the heavier cations Ru3+/4+ and In3+ were tested. Polycrystalline samples Ca3Co4-xRuxO9 and Ca3Co4-xInxO9 (0 < x < 0.21) were prepared via a solid-state-reaction route. For each sample the crystal structure was analyzed and a complete thermoelectric characterization was done within a temperature range of 300 K < T < 1125 K.

Both substitution strategies resulted in a significant decrease of the thermal conductivity (κ). For the In3+-substituted samples the decrease of the Seebeck coefficient (α) balanced the κ reduction so that no overall enhancement of the figure of merit (ZT) was found. The Ru3+/4+ substitution reduced the p-type carrier concentration and thus increases the electrical resistivity (ρel), while α became larger at low temperatures. Despite the reduction of the power factor, a small enhancement in ZT was observed in the case of x = 0.1 Ru substitution, due to the strong κ reduction. Considering the observed preferred orientation of the Ru-substituted crystallites, a maximum value of ZT = 0.14 perpendicular to the pressing direction is found at T = 1125 K, indicating that Ru substitution is a promising strategy for a further ZT improvement.

Keywords

thermoelectricoxidethermal conductivity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium H – Nanoscale Thermoelectric Materials, Thermal and Electrical Transport, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 83 - 92
Copyright
Copyright © Materials Research Society 2013 

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