Development of thermoelectric oxides for renewable energy conversion technologies

A. Weidenkaff, R. Robert, M. Aguirre, L. Bocher, T. Lippert, Stela Canulescu

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Geothermal and solar heat can be directly converted into electricity by using thermoelectric generators. Perovskite-type metal oxides are potential materials to improve the efficiency of these devices. Cobaltates with p-type conductivity and n-type manganates are considered for the development of a ceramic thermoelectric converter. Sintered pellets and thin PLD films with the composition La1-xCaxMO3-delta (x = 0, 0.3, 0.4) (M = Co, Mn) were synthesised and characterised concerning their thermoelectric properties in a broad temperature range. It was found that similar to polycrystalline samples the electrical conductivity of LaCoO3 increases significantly with 40% Ca-substitution due to the formation of Co4+ ions while the thermopower decreases. The thermopower values of the La0.8Ca0.2MnO3-delta films have a negative sign, but become large and positive at temperatures of 1000 K. (c) 2007 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalRenewable Energy
Volume33
Issue number2
Pages (from-to)342-347
ISSN0960-1481
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventSymposium on Materials, Devices, and Prospects for Sustainable Energy of the European-Materials-Research-Society Meeting - Nice, FRANCE
Duration: 1 Jan 2006 → …

Conference

ConferenceSymposium on Materials, Devices, and Prospects for Sustainable Energy of the European-Materials-Research-Society Meeting
CityNice, FRANCE
Period01/01/2006 → …

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