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

Arash Mehdizadeh Dehkordi, Sriparna Bhattacharya, Taghi Darroudi, Mehmet Karakaya, Courtney Kucera, John Ballato, Rasheed Adebisi, Joseph R. Gladden, Ramakrishna Podila, Apparao M. Rao, Husam N. Alshareef, TERRY M. TRITT

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)1470-1476
Number of pages7
JournalMRS Communications
Volume8
Issue number04
DOIs
StatePublished - Nov 14 2018

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