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Structural and Thermoelectric Properties of Ba8Cu x Si23-x Ge23 (4.5 ≤ x ≤ 7)

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Abstract

Intermetallic clathrates are promising materials for thermoelectric applications at elevated temperatures. In the search for cost-competitive representatives, we investigate the thermoelectric properties of quaternary type I clathrates with nominal compositions Ba8Cu x Si23-x Ge23 (4.5 ≤ x ≤ 7). The specimens were prepared by melting and annealing with subsequent ball milling and hot pressing. X-ray diffraction and energy-dispersive x-ray spectroscopy were used for an accurate structure determination and for an analysis of the phase purity and microstructure, respectively. The transport properties show a systematic variation with the Cu content in the clathrate phase. The highest dimensionless thermoelectric figure of merit ZT of 0.31 is achieved for Ba8Cu6Si17Ge23 at about 250°C (520 K).

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Authors and Affiliations

  1. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8–10, 1040, Vienna, Austria

    X. Yan, S. Laumann, E. Bauer & S. Paschen

  2. Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090, Vienna, Austria

    X. Yan, M. Falmbigl, A. Grytsiv & P. Rogl

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  1. X. Yan
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  2. M. Falmbigl
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  3. S. Laumann
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  4. A. Grytsiv
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  5. E. Bauer
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  6. P. Rogl
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  7. S. Paschen
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Correspondence to S. Paschen.

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Yan, X., Falmbigl, M., Laumann, S. et al. Structural and Thermoelectric Properties of Ba8Cu x Si23-x Ge23 (4.5 ≤ x ≤ 7). J. Electron. Mater. 41, 1159–1164 (2012). https://doi.org/10.1007/s11664-011-1897-1

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