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Thermoelectric properties of the tetrahedrite–tennantite solid solutions Cu12Sb4−xAsxS13 and Cu10Co2Sb4−yAsyS13 (0 ≤ x, y ≤ 4)

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Abstract

Tetrahedrites, a class of copper- and sulfur-rich minerals, exhibit inherently very low lattice thermal conductivity and adjustable electronic properties that make them interesting candidates for thermoelectric applications. Here, we investigate the influence of isovalent As substitution on the Sb site on the structural and transport properties (5–700 K) of the two solid solutions Cu12Sb4−xAsxS13 and Cu10Co2Sb4−yAsyS13 (0 ≤ x, y ≤ 4). Electronic band structure calculations predict that As has only a weak influence on the valence bands and hence, on the p-type metallic character of Cu12Sb4S13. In agreement with these predictions, all the samples of the series Cu12Sb4−xAsxS13 exhibit p-type metallic behavior with relatively low electrical resistivity and moderate thermopower values that only slightly evolve with the As content. In contrast, the substitution of Co for Cu in As-rich samples seems less favorable as suggested by a decrease in the Co concentration with increasing the As content. This trend leads to a concomitant increase in the electrical resistivity and thermopower leaving the ZT values practically unchanged with respect to purely Cu-based samples. As a result, peak ZT values ranging between 0.60 and 0.75 are achieved at 700 K for both series. The lack of significant variations in the ZT values confirms the robustness of the thermoelectric performances of tetrahedrites with respect to variations in the Sb-to-As ratio.

Graphical abstract: Thermoelectric properties of the tetrahedrite–tennantite solid solutions Cu12Sb4−xAsxS13 and Cu10Co2Sb4−yAsyS13 (0 ≤ x, y ≤ 4)

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Publication details

The article was received on 12 Jan 2019, accepted on 31 Jan 2019 and first published on 31 Jan 2019


Article type: Paper
DOI: 10.1039/C9CP00213H
Citation: Phys. Chem. Chem. Phys., 2019, Advance Article

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    Thermoelectric properties of the tetrahedrite–tennantite solid solutions Cu12Sb4−xAsxS13 and Cu10Co2Sb4−yAsyS13 (0 ≤ x, y ≤ 4)

    P. Levinsky, C. Candolfi, A. Dauscher, J. Tobola, J. Hejtmánek and B. Lenoir, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP00213H

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