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Nanostructured Nb-substituted CaMnO3 n-type thermoelectric material prepared in a continuous process by ultrasonic spray combustion

Published online by Cambridge University Press:  13 July 2011

Sascha Populoh ,
Matthias Trottmann ,
Myriam H. Aguire  and
Anke Weidenkaff
Sascha Populoh
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland
Matthias Trottmann
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland
Myriam H. Aguire
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland
Anke Weidenkaff*
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland
*
a)Address all correspondence to this author. e-mail: anke.weidenkaff@empa.ch
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Abstract

One way to further optimize the thermoelectric properties toward a higher ZT is a temperature stable nanoengineering of materials, where the thermal conductivity is reduced by increasing the phonon scattering at the grain boundaries. To study this, Nb-substituted CaMnO3 perovskite-type material was synthesized by ultrasonic spray combustion (USC). The grain growth has been characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Finally, the thermoelectric properties of compacted and sintered bulk samples from powder prepared by a continuous scalable USC process were measured up to 1050 K. The thermoelectric legs were prepared by an adapted sintering process. Here, a compromise between enhanced porosity to reduce the thermal conductivity and securing of mechanical stability and low resistivity should be obtained. Based on the grain growth mechanisms, an advanced sintering process for additional interconnection of the particles without particle growth is needed to further increase the thermoelectric performance.

Keywords

ThermoelectricityNanostructureGrain size
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 15: Focus Issue: Advances in Thermoelectric Materials , 14 August 2011 , pp. 1947 - 1952
Copyright
Copyright © Materials Research Society 2011

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References

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