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

Published online by Cambridge University Press:  14 November 2018

Arash Mehdizadeh Dehkordi
Affiliation:
Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA
Sriparna Bhattacharya
Affiliation:
Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC 29634, USA
Taghi Darroudi
Affiliation:
Electron Microscope Facility, Clemson Research Park, Clemson University, Clemson, SC 29634, USA
Mehmet Karakaya
Affiliation:
Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC 29634, USA
Courtney Kucera
Affiliation:
Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
John Ballato
Affiliation:
Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
Rasheed Adebisi
Affiliation:
Department of Physics and National Center for Physical Acoustics, University of Mississippi, Oxford, MS 38677, USA
Joseph R. Gladden
Affiliation:
Department of Physics and National Center for Physical Acoustics, University of Mississippi, Oxford, MS 38677, USA
Ramakrishna Podila
Affiliation:
Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC 29634, USA Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
Apparao M. Rao
Affiliation:
Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC 29634, USA Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
Husam N. Alshareef
Affiliation:
Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Terry M. Tritt
Affiliation:
Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
Corresponding
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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.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2018 

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