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., ...Daha Fazla

MRS COMMUNICATIONS, cilt.8, sa.4, ss.1470-1476, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 8 Sayı: 4
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1557/mrc.2018.220
  • Dergi Adı: MRS COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1470-1476
  • Gazi Üniversitesi Adresli: Evet

Özet

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.