کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
302824 | 512553 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Development of thermoelectric oxides for renewable energy conversion technologies Development of thermoelectric oxides for renewable energy conversion technologies](/preview/png/302824.png)
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.
Journal: Renewable Energy - Volume 33, Issue 2, February 2008, Pages 342–347