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-δ (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-δ films have a negative sign, but become large and positive at temperatures of 1000 K.
Original language | English |
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Journal | Renewable Energy |
Volume | 33 |
Issue number | 2 |
Pages (from-to) | 342-347 |
ISSN | 0960-1481 |
DOIs | |
Publication status | Published - 2008 |
Externally published | Yes |
Event | European Materials Research Society 2006 - Acropolis Congress Centre, Nice, France Duration: 29 May 2006 → 2 Jun 2006 |
Conference
Conference | European Materials Research Society 2006 |
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Location | Acropolis Congress Centre |
Country/Territory | France |
City | Nice |
Period | 29/05/2006 → 02/06/2006 |
Bibliographical note
Part of special issue: E-MRS 2006 Symposium M: Materials, Devices and Prospects for Sustainable EnergyKeywords
- Solar energy
- Thermoelectricity
- Geothermal energy
- Perovskites
- Thin films