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Thermoelectric properties of directionally grown Bi2Ba2Co2Oδ/Ag composites: effect of annealing

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Abstract

Bi2Ba2Co2Oδ thermoelectric ceramics with Ag additions (0, 1, 3, and 5 wt%) have been successfully textured using the laser floating zone method. Microstructure has shown that samples are composed by thermoelectric grains, together with a high amount of secondary phases, and that 3 wt% Ag addition leads to the best grain orientation. These microstructural benefits have been reflected in the highest thermoelectric performances determined in these samples. It has also been found that annealing procedure leads to a drastic decrease of secondary phases amount and raises the oxygen content in the thermoelectric phase. These modifications are reflected in an important decrease of electrical resistivity, ρ (compared to the as-grown samples) without drastic modification of Seebeck coefficient, S. As a consequence, the highest thermoelectric performances, determined through the power factor, have been reached in the 3 wt% Ag textured and annealed samples in the whole measured temperature range. The maximum PF (=S2/ρ) values at 650 °C determined in these samples are very close to the highest reported in single crystals or very low rate LFZ grown Bi2Ba2Co2Oδ compounds, making them very attractive for practical applications.

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Acknowledgments

This research has been supported by the Spanish MINECO-FEDER (MAT2013-46505-C3-1-R). The authors wish to thank the Gobierno de Aragón and Fondo Social Europeo (Consolidated Research Groups T87 and T12) for financial support and to C. Gallego, and C. Estepa for their technical assistance. Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.

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  1. Instituto de Ciencia de Materiales de Aragón (CSIC-Universidad de Zaragoza), Mª de Luna, 3, 50018, Zaragoza, Spain

    Sh. Rasekh, A. Sotelo, M. A. Torres, P. Bosque, M. A. Madre & J. C. Diez

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  1. Sh. Rasekh
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Correspondence to M. A. Madre.

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Rasekh, S., Sotelo, A., Torres, M.A. et al. Thermoelectric properties of directionally grown Bi2Ba2Co2Oδ/Ag composites: effect of annealing. J Mater Sci: Mater Electron 27, 12964–12973 (2016). https://doi.org/10.1007/s10854-016-5435-z

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