processing effects on the thermoelectric properties of bi2ca2co1.7ox ceramics

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ID: 185534
2014
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Abstract
Bi2Ca2Co1.7Ox bulk polycrystalline ceramics were prepared by the solid state method and by directional growth. Moreover, the effect of annealing on the textured materials has been studied. Microstructure has shown randomly oriented grains in the classical sintered materials while in the textured samples those were well oriented with their c-axis nearly perpendicular to the growth direction. Furthermore, the textured-annealed samples showed much lower amount of secondary phases than the as-grown ones. These microstructural changes are reflected on the thermoelectric properties which increase with the grain orientation and with the decrease on the secondary phase content mainly due to the electrical resistivity reduction. As a consequence, a raise on the power factor of about 6 and 9 times, compared with the classically sintered samples, was obtained for the as-grown and textured-annealed ones, respectively. The maximum power factor obtained at 650 ºC in the textured-annealed samples (~ 0.31 mW/K2m) is about 50 % higher, at the same temperature, than the obtained in one of the most used methods for texturing this kind of materials, the sinter-forging process.

Se han preparado cerámicas policristalinas volumétricas de Bi2Ca2Co1.7Ox por medio del método clásico de estado sólido y por crecimiento direccional. Además, se ha estudiado el efecto del recocido en los materiales texturados. La microestructura ha mostrado granos orientados al azar en las muestras preparadas por sinterizado en estado sólido, mientras que en las muestras texturadas se orientaban con el eje c perpendicular a la dirección de crecimiento. Por otro lado, las muestras texturadas-recocidas mostraban una cantidad mucho menor de fases secundarias que las crecidas. Estos cambios en la microestructura se reflejan en las propiedades termoeléctricas, que aumentan con la orientación de los granos y con la disminución del contenido en fases secundarias, principalmente por la reducción en los valores de la resistividad eléctrica. Como consecuencia, se han producido aumentos del factor de potencia entre 6 y 9 veces los valores obtenidos en las muestras sinterizadas, en las crecidas y texturadas-recocidas, respectivamente. El máximo valor del factor de potencia se ha obtenido a 650 ºC en las muestras texturadas-recocidas (~ 0.31 mW/K2m), que es alrededor del 50 % mayor, a la misma temperatura, del que se ha obtenido en muestras procesadas por forjado en caliente, que es uno de los procesos más utilizados para texturar este tipo de materiales.
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2014boletnprocessing Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Rasekh, Sh. ;Constantinescu, G. ;Madre, M. A.;Torres, M. A.;Diez, J. C.;Sotelo, A.
Journal medicinal chemistry (shariqah (united arab emirates))
Year 2014
DOI
10.3989/cyv.242014
URL
http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/1291/1322
Keywords
sintering glass Ceramics

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