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Modeling the Thermoelectric Properties of Ti5O9 Magnéli Phase Ceramics

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Abstract

Magnéli phase Ti5O9 ceramics with 200-nm grain-size were fabricated by hot-pressing nanopowders of titanium and anatase TiO2 at 1223 K. The thermoelectric properties of these ceramics were investigated from room temperature to 1076 K. We show that the experimental variation of the electrical conductivity with temperature follows a non-adiabatic small-polaron model with an activation energy of 64 meV. In this paper, we propose a modified Heikes-Chaikin-Beni model, based on a canonical ensemble of closely spaced titanium t 2g levels, to account for the temperature dependency of the Seebeck coefficient. Modeling of the thermal conductivity data reveals that the phonon contribution remains constant throughout the investigated temperature range. The thermoelectric figure-of-merit ZT of this nanoceramic material reaches 0.3 K at 1076 K.

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ACKNOWLEDGEMENTS

The authors would like to thank the Office of Naval Research (O.N.R.) for supporting this work (N00014-11-1-0136). The authors also thank Natalio Mingo and Jesus Carrete for various technical discussions.

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Authors and Affiliations

  1. Department of Physics, University of Central Florida, Orlando, FL, 32816, USA

    Sudeep J. Pandey

  2. Evident Thermoelectrics, Troy, NY, 12180, USA

    Giri Joshi

  3. Department of Material Science and Engineering, Duke University, Durham, NC, 27708, USA

    Shidong Wang & Stefano Curtarolo

  4. College of Optics and Photonics, CREOL, University of Central Florida, Orlando, FL, 32816, USA

    Romain M. Gaume

  5. Department of Material Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA

    Romain M. Gaume

  6. NanoScience Technology Center, University of Central Florida, Orlando, FL, 32816, USA

    Romain M. Gaume

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  1. Sudeep J. Pandey
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  2. Giri Joshi
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  3. Shidong Wang
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  4. Stefano Curtarolo
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  5. Romain M. Gaume
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Correspondence to Sudeep J. Pandey.

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Pandey, S.J., Joshi, G., Wang, S. et al. Modeling the Thermoelectric Properties of Ti5O9 Magnéli Phase Ceramics. J. Electron. Mater. 45, 5526–5532 (2016). https://doi.org/10.1007/s11664-016-4762-4

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  • DOI: https://doi.org/10.1007/s11664-016-4762-4

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