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High mechanical and thermoelectric performances in hot-pressed CdO

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Abstract

High density bulk CdO polycrystalline thermoelectric ceramics have been prepared through a hot-pressing process. Density measurements have revealed that it reaches 99.5% of the theoretical one, in agreement with the observed microstructure. Microhardness has shown to have indentation size effect, decreasing when the load is raised. Electrical resistivity shows metallic-like behaviour until 650 °C and semiconducting-like one at higher temperatures while Seebeck coefficient increases in the metallic-like region and decreases in the semiconducting one. The maximum power factor values, 1.6 mW/K2m, have been achieved at about 650 °C. These values are the highest obtained in this family of materials, with the advantage of its low thermal treatment duration, when compared with the typical solid state sintering process.

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Acknowledgements

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

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Correspondence to M. A. Madre.

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Madre, M.A., Torres, M.A. & Sotelo, A. High mechanical and thermoelectric performances in hot-pressed CdO. J Mater Sci: Mater Electron 28, 5518–5522 (2017). https://doi.org/10.1007/s10854-016-6214-6

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  • DOI: https://doi.org/10.1007/s10854-016-6214-6

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