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Filled Skutterudite Antimonides: Validation of the Electron-Crystal Phonon-Glass Approach to New Thermoelectric Materials

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Abstract

After a brief review of the transport and thermoelectric properties of filled skutterudite antimonides, we present resonant ultrasound, specific heat, and inelastic neutron scattering results that establish the existence of two low-energy vibrational modes in the filled skutterudite LaFe3CoSb12. It is likely that at least one of these modes represents the localized, incoherent vibrations of the La ion in an oversized atomic “cage.” These results support the usefulness of weakly bound, “rattling” ions for the improvement of thermoelectric performance.

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Acknowledgement

Oak Ridge National Laboratory is managed by the Lockheed Martin Energy Research Corporation for the U.S. Department of Energy under contract No. DE-AC05-96OR22464. Work at Los Alamos was performed under the auspices of the U.S. Department of Energy. Research at UCSD was supported by the U.S. Department of Energy under grant No. DE-FG03-86ER-45230 and the National Science Foundation under grant No. DMR-94-08835.

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Authors and Affiliations

  1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    D. Mandrus, B. C. Sales, V. Keppens, B. C. Chakoumakos, P. Dai, L. A. Boatner & J. R. Thompson

  2. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    R. K. Williams

  3. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    T. W. Darling & A. Migliori

  4. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, CA, 92093 p[USA

    M. B. Maple, D. A. Gajewski & E. J. Freeman

Authors
  1. D. Mandrus
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  2. B. C. Sales
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  3. V. Keppens
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  4. B. C. Chakoumakos
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  5. P. Dai
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  6. L. A. Boatner
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  7. R. K. Williams
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  8. J. R. Thompson
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  9. T. W. Darling
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  10. A. Migliori
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  11. M. B. Maple
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  12. D. A. Gajewski
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  13. E. J. Freeman
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Mandrus, D., Sales, B.C., Keppens, V. et al. Filled Skutterudite Antimonides: Validation of the Electron-Crystal Phonon-Glass Approach to New Thermoelectric Materials. MRS Online Proceedings Library 478, 199–209 (1997). https://doi.org/10.1557/PROC-478-199

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  • DOI: https://doi.org/10.1557/PROC-478-199

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