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High thermoelectric performance in Bi2-xPbxBa2Co1.7Oy samples textured by directional growth from the melt

AuthorsEstepa, L. C.; Madre, M. A.; Costa, F. M.; Ferreira, N. M.; Torres, M. A. ; Rasekh, Sh.; Sotelo, A.; Diez, J. C.
Issue Date2016
CitationXIV CNMAT (2016)
AbstractBi2-xPbxBa2Co2Oy (x=0.0, 0.2, 0.4, and 0.6) misfit compounds were grown by the laser floating zone technique. Microstructural analysis has shown the formation of thermoelectric grains together with high amount of secondary phases. The thermoelectric grains orientation is increased with Pb content up to 0.4Pb, while further substitution drastically destroys the preferential grain orientation. In spite of the amount of secondary phases, the electrical resistivity is very low when compared with the values obtained in sintered materials. As a consequence of the low resistivity power factor values at 650 ºC increase four to eight times the values obtained in sintered materials. Moreover, the performance of these materials was further improved subjecting the as-grown samples to a postannealing step due to the decrease of secondary phases and the rise of thermoelectric phase content. These microstructural modifications led to a high decrease of electrical resistivity, improving power factor in around a factor two at room temperature, compared with the as-grown samples. Moreover, the low thermal conductivity of the textured annealed samples leads to a maximum estimated ZT value of 0.53 for the 0.2 Pb-doped samples, much higher than the obtained in Pb-doped ones reported in literature.
DescriptionResumen del trabajo presentado al XIV Congreso Nacional de Materiales celebrado en Gijón del 8 al 10 de junio de 2016.
Appears in Collections:(ICMA) Comunicaciones congresos
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