Phase Stability, Crystal Structure, and Thermoelectric Properties of Cu12Sb4S13-xSex Solid Solutions

Xu Lu, Donald T. Morelli, Yuxing Wang, Wei Lai, Yi Xia, Vidvuds Ozolins

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    Abstract

    The solubility of selenium on the sulfur site in tetrahedrite Cu12Sb4S13 has been investigated by theoretical calculations, and the results have been verified by X-ray diffraction and X-ray synchrotron studies on Cu12Sb4S13-xSex with x ranging from zero to 3. Density-functional theory calculations predict that Se substitution on the tetrahedral 24g site is preferred, and this is found to be consistent with Rietveld refinement of the crystal structure. High temperature thermoelectric property measurements on Cu12Sb4S13-xSex reveal that Se substitution results in a decrease in electrical resistivity without diminution of the Seebeck coefficient. The "decoupling" of these parameters leads to a 30% enhancement in power factor of the x = 1 sample compared to that of pure Cu12Sb4S13. In addition, in spite of an increased electronic thermal conductivity, alloy scattering of phonons caused by Se substitution reduces both the lattice and total thermal conductivities, leading to a large increase in the thermoelectric figure of merit.

    Original languageEnglish (US)
    Pages (from-to)1781-1786
    Number of pages6
    JournalChemistry of Materials
    Volume28
    Issue number6
    DOIs
    StatePublished - Mar 22 2016

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    Cite this

    Phase Stability, Crystal Structure, and Thermoelectric Properties of Cu12Sb4S13-xSex Solid Solutions. / Lu, Xu; Morelli, Donald T.; Wang, Yuxing; Lai, Wei; Xia, Yi; Ozolins, Vidvuds.

    In: Chemistry of Materials, Vol. 28, No. 6, 22.03.2016, p. 1781-1786.

    Research output: Contribution to journalArticle

    Lu, Xu; Morelli, Donald T.; Wang, Yuxing; Lai, Wei; Xia, Yi; Ozolins, Vidvuds / Phase Stability, Crystal Structure, and Thermoelectric Properties of Cu12Sb4S13-xSex Solid Solutions.

    In: Chemistry of Materials, Vol. 28, No. 6, 22.03.2016, p. 1781-1786.

    Research output: Contribution to journalArticle

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    abstract = "The solubility of selenium on the sulfur site in tetrahedrite Cu12Sb4S13 has been investigated by theoretical calculations, and the results have been verified by X-ray diffraction and X-ray synchrotron studies on Cu12Sb4S13-xSex with x ranging from zero to 3. Density-functional theory calculations predict that Se substitution on the tetrahedral 24g site is preferred, and this is found to be consistent with Rietveld refinement of the crystal structure. High temperature thermoelectric property measurements on Cu12Sb4S13-xSex reveal that Se substitution results in a decrease in electrical resistivity without diminution of the Seebeck coefficient. The {"}decoupling{"} of these parameters leads to a 30% enhancement in power factor of the x = 1 sample compared to that of pure Cu12Sb4S13. In addition, in spite of an increased electronic thermal conductivity, alloy scattering of phonons caused by Se substitution reduces both the lattice and total thermal conductivities, leading to a large increase in the thermoelectric figure of merit.",
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    AU - Morelli,Donald T.

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    AU - Lai,Wei

    AU - Xia,Yi

    AU - Ozolins,Vidvuds

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