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Thermoelectric Oxides and Oxynitrides with Perovskite-type Structure

Published online by Cambridge University Press:  01 February 2011

Anke Weidenkaff
Affiliation:
anke.weidenkaff@empa.ch, Empa, Solid State Chemistry and Catalysis, Ueberlandstr. 129, Duebendorf, 8600, Switzerland
Laura Bocher
Affiliation:
laura.bocher@empa.ch, Empa, Duebendorf, 8600, Switzerland
Rosa Robert
Affiliation:
rosa.robert@empa.ch, Empa, Duebendorf, 8600, Switzerland
Myriam Aguirre
Affiliation:
myriam.aguirre@empa.ch, Empa, Duebendorf, 8600, Switzerland
Dmitry Logvinovich
Affiliation:
dmitry.logvinovich@empa.ch, Empa, Duebendorf, 8600, Switzerland
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Abstract

Transition metal oxides and oxynitrides with perovskite-type structures are potential high temperature stable thermoelectric materials. With innovative soft chemistry synthesis procedures the crystallite size in complex oxide ceramics with perovskite-type structure can be decreased compared to classical synthesis routes and allows to lower the heat conductivity dramatically while a large power factor can be maintained at the same time. Submicron crystallites are beneficial to lower the lattice thermal conductivity without influencing the electron mobility.

In this work, perovskite-type cobaltates, molybdates and manganates are studied. The influence of heterostructures and nanocrystalline domains in perovskite oxides/oxynitrides and the correlation with transport properties and Seebeck coefficient will be discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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