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Optimizing thermal conduction in bulk polycrystalline SrTiO3−δ ceramics via oxygen non-stoichiometry

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Abstract

while SrTiO3 exhibits promising electronic transport properties, its high thermal conductivity (κ) is detrimental for its use as a thermoelectric material. Here, we investigate the influence of oxygen non-stoichiometry on κ in bulk SrTiO3 ceramics. A significant reduction in κ was achieved in oxygen deficient SrTiO3−δ, owing to the presence of oxygen vacancies that act as phonon scattering centers. Upon oxidation of SrTiO3−δ, the κ of pristine SrTiO3 was recovered, suggesting that oxygen vacancies were indeed responsible for the reduction in κ. Raman spectroscopy was used as an independent tool to confirm the reduction of oxygen vacancies in SrTiO3−δ upon oxidation.

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Acknowledgments

The research was supported by KAUST-Clemson Faculty Initiated collaboration grant. The authors would like to thank W.G. Nilsen and J.G. Skinner[35] for the reprint their Raman spectra to directly compare with our Raman spectra. The authors would like to acknowledge useful discussions with Dr. Colin McMillen (Clemson University) on the XRD analysis of these samples and Mr. Herbert Behlow on stoichiometric analysis.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29634, USA

    Arash Mehdizadeh Dehkordi, Courtney Kucera, John Ballato & Terry M. Tritt

  2. Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC, 29634, USA

    Sriparna Bhattacharya, Mehmet Karakaya, Ramakrishna Podila & Apparao M. Rao

  3. Electron Microscope Facility, Clemson Research Park, Clemson University, Clemson, SC, 29634, USA

    Taghi Darroudi

  4. Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC, 29634, USA

    Courtney Kucera, John Ballato, Ramakrishna Podila & Apparao M. Rao

  5. Department of Physics and National Center for Physical Acoustics, University of Mississippi, Oxford, MS, 38677, USA

    Rasheed Adebisi & Joseph R. Gladden

  6. Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia

    Husam N. Alshareef

  7. Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634, USA

    Terry M. Tritt

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  1. Arash Mehdizadeh Dehkordi
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  2. Sriparna Bhattacharya
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  3. Taghi Darroudi
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  7. Rasheed Adebisi
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  9. Ramakrishna Podila
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  10. Apparao M. Rao
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  11. Husam N. Alshareef
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Correspondence to Sriparna Bhattacharya.

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Dehkordi, A.M., Bhattacharya, S., Darroudi, T. et al. Optimizing thermal conduction in bulk polycrystalline SrTiO3−δ ceramics via oxygen non-stoichiometry. MRS Communications 8, 1470–1476 (2018). https://doi.org/10.1557/mrc.2018.220

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