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RENDIMIENTO TERMOELÉCTRICO EN COMPÓSITOS DE Ca2:94Y0:06Co4O9+d/Ag
TERMOELECTRIC PERFORMANCE OF Ca2:94Y0:06Co4O9+d/Ag COMPOSITES
Keywords:
Rendimiento termoeléctrico, Compósitos de Ca2, 94Y0, 06Co4O9 d/Ag, Propiedades de transporte. (es)Thermoelectric performance, Ca2, 94Y0, 06Co4O9 d/Ag composites, Transport properties. (en)
Utilizando el método de reacción de estado sólido se prepararon compósitos de Ca2:94Y0:06Co4O9+d/Ag, donde el contenido de plata tomó valores en proporciones de masa entre 0% y 10 %. Sus propiedades de transporte se estudiaron en función de la temperatura a partir de mediciones de resistividad eléctrica r(T) y coeficiente Seebeck S(T). La magnitud de la resistividad eléctrica decrece con el contenido de plata presente, hasta valores próximos a 3 mW -cm. El coficiente Seebeck es positivo en todo el rango de temperatura estudiado sugiriendo una conducción eléctrica dada por portadores de carga positivos. El rendimiento termoeléctrico se evaluó a partir del cálculo del factor de potencia PF, el cual se incrementa con el nivel de plata adicionada alcanzando valores máximos cercanos a 9:5 mW=K2cm. El comportamiento mostrado por las propiedades de transporte permiten proponer estos compósitos como potenciales materiales con aplicaciones termoeléctricas.
By using the solid state reaction method composites of Ca2:94Y0:06Co4O9+d/Ag were growth, the silver weight ratios take values between 0% and 10 %. Their transport properties were studied from electrical resistivity r(T) and Seebeck coefficient S(T) measurements as function of temperature. The magnitude of the electrical resistivity decreases with the Ag content present in the composites. The Seebeck coefficient is positive throughout the studied temperature range suggesting a conduction given by positive charge carriers. Thermoelectric performance was assessed through the thermoelectric power factor, PF, which increases with the added Ag level. This parameter reaches maximum values around 9:5 mW=K2cm: The observed behaviour in the transport properties become these ceramic composites promising thermoelectric materials.
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