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Effect of Composition on Thermoelectric Properties of As-Cast Materials: The Cu12−xCoxSb4S13−ySey Case

  • Topical Collection: International Conference on Thermoelectrics 2018
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Abstract

Samples with Cu12−xCoxSb4S13−ySey (0 ≤ x ≤ 2, 0 ≤ y ≤ 1) nominal compositions were prepared by melting the elements under vacuum, followed by slow cooling. The phases formed in this process were identified and characterized by powder x-ray diffraction and scanning electron microscopy observations, complemented with energy-dispersive spectroscopy. All samples have tetrahedrite as the major phase (> 78 vol.%). However, minority phases like skinnerite and chalcostibite are usually also observed, the number and volume of them increasing with the increase of cobalt content. Measurements of electrical resistivity and Seebeck coefficient showed that these materials can present large power factors, with the Cu11.5Co0.5Sb4S12Se sample having a room temperature value higher than 200 μW K−2 m−1.

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Acknowledgments

This work was partially supported by Fundação para a Ciência e Tecnologia (FCT), Portugal, through the contracts UID/Multi/04349/2013 and POCI-01-0145-FEDER-016674, and by the Project THERMOSS (M-ERA-NET2/0010/2016).

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Authors and Affiliations

  1. C2TN, DECN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066, Bobadela LRS, Portugal

    Tiago Kalil Cortinhas Alves, Gonçalo Domingues, Elsa Branco Lopes & António Pereira Gonçalves

  2. Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Scharnhorststr. 20, 04275, Leipzig, Germany

    Tiago Kalil Cortinhas Alves

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  1. Tiago Kalil Cortinhas Alves
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  2. Gonçalo Domingues
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  3. Elsa Branco Lopes
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  4. António Pereira Gonçalves
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Correspondence to António Pereira Gonçalves.

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Alves, T.K.C., Domingues, G., Branco Lopes, E. et al. Effect of Composition on Thermoelectric Properties of As-Cast Materials: The Cu12−xCoxSb4S13−ySey Case. J. Electron. Mater. 48, 2028–2035 (2019). https://doi.org/10.1007/s11664-019-06956-7

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  • DOI: https://doi.org/10.1007/s11664-019-06956-7

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