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Effect of Ag additions on the Bi 1.6 Pb 0.4 Sr 2 Co 1.8 O x thermoelectric properties

Diez, J. C., Rasekh, Sh., Constantinescu, G. and 3 more

Boletín de la Sociedad Española de Cerámica y Vidrio · 2013

doi:10.3989/cyv.122013 (opens in a new tab)

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Abstract

Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Co<sub>1.8</sub>O<sub>x</sub> thermoelectric ceramics with small Ag additions (0, 1, and 3 wt.%) have been successfully produced by a sol-gel method via nitrates. Microstructure has shown a reduction on the amount of secondary phases and an increase on the bulk density with increasing Ag contents. The microstructural evolution, as a function of Ag content, is confirmed with the electrical resistivity values which show an important decrease for the 3 wt.% Ag samples, leading to maximum power factor values of about 0.025 mW/K<sup>2</sup>.m at room temperature, which is about two times higher than the obtained for the Ag-free sintered samples.<br><br>Se han preparado cerámicas termoeléctricas de composición Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Co<sub>1.8</sub>O<sub>x</sub> con pequeñas adiciones de Ag (0, 1, y 3 % en peso) por medio de un método sol-gel a partir de los nitratos metálicos. La microestructura ha mostrado una reducción de la cantidad de fases secundarias y un aumento de la densidad del material al aumentar la cantidad de Ag. La evolución microestructural, en función del contenido de Ag, se ha confirmado con los valores de la resistividad eléctrica que muestra una reducción importante para las muestras con 3 % en peso de Ag, lo que lleva a alcanzar valores máximos del factor de potencia de alrededor de 0.025 mW/K<sup>2</sup>.m a temperatura ambiente, que es dos veces mayor que el obtenido para muestras sinterizadas sin Ag.

Abstract licence: CC BY-NC-ND

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