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Effect of precursors on the microstructure and electrical properties of Bi2Ba2Co2O x

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Abstract

Bi2Ba2Co2O x thermoelectric materials have been prepared through three different synthesis methods. The corresponding precursors were obtained from a coprecipitation method using oxalic acid, attrition milling, and classical solid state method (used as reference). Microstructural studies of precursors have shown that the ones produced by coprecipitation and attrition milling led to smaller grain sizes than the ones obtained through ball milling. Infrared spectroscopy has demonstrated that a thermal treatment at 450 °C totally decomposes the metallic oxalates, producing a mixture of Bi and Co oxides, and Ba carbonate, the same average composition of the other precursors. After sintering procedure, it has been determined that the small grain size precursors produce high-density samples, reflected in a decrease of electrical resistivity without significant modification of the Seebeck coefficient. As a consequence, power factor values are more than two times higher than the measured in samples prepared by the classical solid state method. Moreover, the highest power factor values are in the order of the best reported in textured materials, demonstrating the critical role of precursors in the final properties of these materials.

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Acknowledgements

The authors wish to thank the Gobierno de Aragón-FEDER (Grupos de Investigacion Consolidados T12 and T87) and MINECO-FEDER (MAT2013-46505-C3-1-R) for the financial support. The 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), C/Mª de Luna, 3, 50018, Zaragoza, Spain

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

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  1. A. Sotelo
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Sotelo, A., Torres, M.A., Rasekh, S. et al. Effect of precursors on the microstructure and electrical properties of Bi2Ba2Co2O x . J Aust Ceram Soc 53, 583–590 (2017). https://doi.org/10.1007/s41779-017-0070-6

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