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Effect of Sodium substitution on the thermoelectric properties of Bi2Sr2Co2Ox ceramics

AuthorsÇetin Karakaya, G.; Özçelik, B.; Nane, O.; Sotelo, A.; Rasekh, Sh.; Torres, M. A. ; Madre, M. A.
Issue Date2016
Citation14th ECT (2016)
AbstractBi2Sr2-xNaxCo2Ox polycristalline ceramics with x=0.0, 0.025, 0.050, 0.075, 0.10, 0.125, and 0.15 have been prepared using the classical solid state technique. SEM micrographs have shown that all the Na has been incorporated into the Bi2Sr2Co2Ox structure. It has been found that Na decreases porosity and improves grain growth. The lowest amount of porosity is observed in the highest Na containing samples (x=0.15). The temperature dependence of electrical resistivity, as a function of Na content, shows two kind of behaviors. For samples up to x=0.05 a semiconducting-like behavior (dρ/dT<0) from room temperature to about 550 ºC and a slightly metallic-like one (dρ/dT>0) at higher temperatures, has been found. For higher Na content, a slightly metallic-like behavior is observed. Moreover, when increasing Na content, a significant reduction on the resistivity values at room temperature is produced, in agreement with an increase of apparent density. On the other hand, Seebeck coefficient shows smaller variations than expected from the resistivity variations. Power Factor increases with Na content until 0.125, decreasing for further Na addition. These results indicate that small Na-substitution can be very useful in order to strongly reduce electrical resistivity and, as a consequence, raising the thermoelectric performances of these ceramic materials.
DescriptionResumen del póster presentado a la 14th European Conference on Thermoelectrics, celebrada en Lisboa (Portugal) del 20 al 30 de septiembre de 2016.
Appears in Collections:(ICMA) Comunicaciones congresos
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