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


Dehkordi A. M. , Bhattacharya S., Darroudi T., KARAKAYA M. , Kucera C., Ballato J., ...More

MRS COMMUNICATIONS, vol.8, no.4, pp.1470-1476, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 4
  • Publication Date: 2018
  • Doi Number: 10.1557/mrc.2018.220
  • Title of Journal : MRS COMMUNICATIONS
  • Page Numbers: pp.1470-1476

Abstract

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