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Issue 8, 2013
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Influence of Sn-substitution on the thermoelectric properties of the clathrate type-I, Ba8ZnxGe46−xySny

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Abstract

A systematic investigation is presented on the influence of Sn-substitution in the clathrate-I compound Ba8ZnxGe46−xySny, particularly for the crystal structure and thermoelectric properties including electrical resistivity, Seebeck coefficient, and thermal conductivity. Two series of samples were prepared to explore the changes for different Sn-contents, (y), and to define the optimum Zn-content, (x), for Ba8ZnxGe46−xySny. Sn-incorporation leads to a linear expansion of the unit cell parameters. Sn-atoms occupy the 6d and 24k positions of the clathrate type-I structure (SG Pm[3 with combining macron]n, standardized setting). Whereas the electrical resistivity and the Seebeck coefficient modify only slightly compared to Ba8ZnxGe46−x, the thermal conductivity is significantly decreased by the Sn-atoms incorporated into the clathrate-I framework. Furthermore the charge carrier mobility is larger and the effective mass (m* = 1.7 me) is much smaller than those of the ternary compound Ba8ZnxGe46−x. The maximum thermoelectric figure of merit is improved by 80% and reaches ZT = 0.82 at 850 K for Ba8Zn7.66Ge36.55Sn1.79.

Graphical abstract: Influence of Sn-substitution on the thermoelectric properties of the clathrate type-I, Ba8ZnxGe46−x−ySny

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Publication details

The article was received on 04 Sep 2012, accepted on 30 Nov 2012 and first published on 30 Nov 2012


Article type: Paper
DOI: 10.1039/C2DT32049E
Citation: Dalton Trans., 2013,42, 2913-2920
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    Influence of Sn-substitution on the thermoelectric properties of the clathrate type-I, Ba8ZnxGe46−xySny

    M. Falmbigl, A. Grytsiv, P. Rogl, X. Yan, E. Royanian and E. Bauer, Dalton Trans., 2013, 42, 2913
    DOI: 10.1039/C2DT32049E

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