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High Power Factor of HPHT-Sintered GeTe-AgSbTe2 Alloys

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Abstract

The thermopower and electrical resistivity of alloys of GeTe and AgSbTe2 (TAGS) sintered at high pressure (up to 4.5 GPa) and high temperature (HPHT) have been studied from 300 K to 750 K. An apparatus for measuring thermopower and electrical resistivity at temperatures >300 K is described. The linear temperature dependence of thermopower and electrical conductivity indicates that these materials are likely to be degenerate semiconductors. At a sintering pressure of 4.0 GPa, the calculated power factor shows a steady progression, reaching a maximum at a sintering temperature of 800°C, with a subsequent decrease at the highest sintering temperature of 850°C. The maximum power factor of 4.32 × 10−3 W m−1 K−2 at ~675 K is ~25% higher than reported values. These results illustrate that HPHT processing is a feasible and controllable way of tuning the properties of thermoelectric materials.

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Authors and Affiliations

  1. Baker Laboratory, Department of Chemistry, Cornell University, Ithaca, NY, 14853-1301, USA

    Yongkwan Dong & Francis J. DiSalvo

  2. Diamond Innovations, 6325 Huntley Road, Worthington, OH, 43085, USA

    Abds-Sami Malik

Authors
  1. Yongkwan Dong
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  2. Abds-Sami Malik
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  3. Francis J. DiSalvo
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Correspondence to Abds-Sami Malik.

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Dong, Y., Malik, AS. & DiSalvo, F.J. High Power Factor of HPHT-Sintered GeTe-AgSbTe2 Alloys. J. Electron. Mater. 40, 17–24 (2011). https://doi.org/10.1007/s11664-010-1383-1

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  • DOI: https://doi.org/10.1007/s11664-010-1383-1

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