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Applied Physics A

, 125:197 | Cite as

Electrical conductivity, magnetism, and optical properties of reduced \(\hbox {BaCeO}_3\)

  • Phieraya Pulphol
  • Naratip Vittayakorn
  • Wanwilai Vittayakorn
  • Taras KolodiazhnyiEmail author
Article
  • 32 Downloads

Abstract

\(\hbox {BaCeO}_3\)-based perovskites are well-known proton and oxygen ion conductors. For practical applications as electrolytes in solid oxide fuel cells, these compounds must be robust towards reduction of cerium ion. In this work, we explore the effect of reducing atmosphere on the physical properties of undoped and Nb-doped \(\hbox {BaCeO}_3\). The \(\hbox {BaCeO}_3\) perovskite structure is thermodynamically stable at least up to 1450 \(^{\circ }\hbox {C}\) upon annealing in \(\hbox {H}_2\)-containing atmosphere. Annealing at 1550 \(^{\circ }\hbox {C}\) causes a decomposition of the \(\hbox {BaCeO}_3\). The higher annealing temperature leads to higher concentration of \(\hbox {Ce}^{3+}\) ions and a higher electrical conductivity. With increasing the annealing temperature from 1300 to 1450 \(^{\circ }\hbox {C}\), the activation energy of conductivity decreases from \(\hbox {E}_a\) = 0.31–0.263 eV. We attribute the electrical conductivity in reduced \(\hbox {BaCeO}_3\) to the activation of the small polaron hopping in agreement with the recent first-principles calculations. However, in contrast to the theoretical predictions, we find no evidence of the \(\hbox {Ce}^{3+}\)\(\hbox {Ce}^{3+}\) spin-singlet small bipolarons.

Notes

Acknowledgements

P.P. was financially supported by KMITL for PhD scholarship and internal NIMS Grant PA4020. The work of N.V. was supported by King Mongkut’s Institute of Technology Ladkrabang under Grant 2562-01-05-46. N.V. and T.K. would like to acknowledge the “Academic Melting-Pot” program.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Electroceramic Research Laboratory, College of NanotechnologyKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  2. 2.Advanced Material Research Unit, Faculty of ScienceKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  3. 3.Nano-KMITL Center of Excellence on Nanoelectronic DevicesKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  4. 4.National Institute for Materials ScienceTsukubaJapan

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