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High-Temperature Stability of Hot-Pressed Sr-Doped Ca3Co4O9

  • Topical Collection: International Conference on Thermoelectrics 2018
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Abstract

Bulk textured Ca2.93Sr0.07Co4O9 samples have been prepared by hot uniaxial pressing followed by thermal treatment at 800°C under air for between 0 h and 1532 h. The microstructural, thermoelectric, and mechanical properties as well as density of all the samples were evaluated as a function of the duration of thermal treatment. Scanning electron microscopy characterization showed that the samples were mainly composed of Sr-doped Ca3Co4O9 thermoelectric (TE) phase, accompanied by minor amounts of Sr-free Ca3Co2O6 secondary phase. After an initial decrease of density after the first aging treatment, it remained practically constant for longer durations. This behavior is reflected in the mechanical properties, which slightly decreased after 12 h of thermal treatment, compared with the as-hot-pressed state, but remained practically constant after larger durations. However, the TE properties were not affected by the aging process, lying within typical errors independently of the aging duration. Moreover, the power factor values measured at 850°C (> 0.60 mW/K2 m) lie among the highest obtained so far for this kind of material.

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Acknowledgments

This research has been supported by the Spanish MINECO-FEDER (MAT2017-82183-C3-1-R), the Basque Government Industry Department through the Elkartek program (Exp: KK-2017/00099 - HiTOM), and the Gobierno de Aragón-FEDER (Research Group T 54-17R). The authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.

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Authors and Affiliations

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

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

  2. Mondragon Unibertsitatea, 20500, Arrasate, Guipúzcoa, Spain

    I. Urrutibeascoa

  3. Centro Stirling S. Coop, 20550, Aretxabaleta, Guipúzcoa, Spain

    G. García

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  1. M. A. Madre
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  2. I. Urrutibeascoa
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  3. G. García
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  4. M. A. Torres
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  5. A. Sotelo
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  6. J. C. Diez
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Correspondence to M. A. Madre.

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Madre, M.A., Urrutibeascoa, I., García, G. et al. High-Temperature Stability of Hot-Pressed Sr-Doped Ca3Co4O9. J. Electron. Mater. 48, 1965–1970 (2019). https://doi.org/10.1007/s11664-018-6748-x

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  • DOI: https://doi.org/10.1007/s11664-018-6748-x

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