The effect of Te substitution for sb on thermoelectric properties of tetrahedrite

    Research output: Research - peer-reviewArticle

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    Abstract

    We present the study of the effect of Te substitution on the thermoelectric properties for Sb in Cu12Sb4-x Te x S 13 tetrahedrite compounds with x ranging from 0.2 to 1.5 in the temperature range of room temperature to 723 K. Powder x-ray diffraction and electron microscopy results indicate a successful homogenous substitution without the alteration of the crystal structure or the introduction of secondary phases. Thermoelectric property measurements show that the excess electrons from Te during the substitution fill the unoccupied levels near the top of the valence bands in pure Cu12Sb4S13 compound, moving the Fermi level closer to the top of the valence bands. This leads to an enhancement in thermopower but also to an increase in electrical resistivity. Overall, the reduction in total thermal conductivity gives rise to improved ZT values in all substituted samples. The highest ZT value obtained in this study is 0.92 at 723 K for x = 1, which is comparable to that of other p-type bulk thermoelectric materials.

    LanguageEnglish (US)
    Pages1983-1987
    Number of pages5
    JournalJournal of Electronic Materials
    Volume43
    Issue number6
    DOIs
    StatePublished - 2014

    Profile

    Substitution reactions
    substitutes
    Valence bands
    Temperature
    valence
    Thermoelectric power
    Fermi level
    Powders
    Electron microscopy
    Thermal conductivity
    Diffraction
    Crystal structure
    X rays
    Electrons
    thermoelectric materials
    electron microscopy
    x ray diffraction
    thermal conductivity
    microscopy
    electrical resistivity

    Keywords

    • Low thermal conductivity
    • mineral-based compound
    • tetrahedrites
    • thermoelectric

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Materials Chemistry

    Cite this

    The effect of Te substitution for sb on thermoelectric properties of tetrahedrite. / Lu, Xu; Morelli, Donald.

    In: Journal of Electronic Materials, Vol. 43, No. 6, 2014, p. 1983-1987.

    Research output: Research - peer-reviewArticle

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    AB - We present the study of the effect of Te substitution on the thermoelectric properties for Sb in Cu12Sb4-x Te x S 13 tetrahedrite compounds with x ranging from 0.2 to 1.5 in the temperature range of room temperature to 723 K. Powder x-ray diffraction and electron microscopy results indicate a successful homogenous substitution without the alteration of the crystal structure or the introduction of secondary phases. Thermoelectric property measurements show that the excess electrons from Te during the substitution fill the unoccupied levels near the top of the valence bands in pure Cu12Sb4S13 compound, moving the Fermi level closer to the top of the valence bands. This leads to an enhancement in thermopower but also to an increase in electrical resistivity. Overall, the reduction in total thermal conductivity gives rise to improved ZT values in all substituted samples. The highest ZT value obtained in this study is 0.92 at 723 K for x = 1, which is comparable to that of other p-type bulk thermoelectric materials.

    KW - Low thermal conductivity

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