Proton conduction of BaCe0.90Y0.10O3 -δ Thin film with lattice distortion

Tohru Higuchi, Tomohiro Owaku, Yasutaka Iida, Enju Sakai, Masaki Kobayashi, Hiroshi Kumigashira

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The proton conduction of BaCe0.9Y0.1O3 -δ (BCY) film on Al2O3 (0001) substrate grown by RF magnetron sputtering has been studied as a function of film thickness (20-600 nm) in the temperature region of 300-700 °C. The lattice constants and grain size of the as-deposited film increase with increasing film thickness. The film thickness above ~ 200 nm, which close to the lattice constants of the bulk, shows high proton conductivity with small activation energy (EA) of ~ 0.3 eV below 500 °C. The BCY thin film has the mixed valent states of Ce4 + and Ce3 + created by the charge transfer from O 2p to Ce 4f states. The EA corresponds to the energy difference between the top of valence band and the Fermi level. These results originate to the changes of O-O bond length and oxygen vacancies in the a-c plane of the BCY thin film.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalSolid State Ionics
Volume270
DOIs
Publication statusPublished - 2015 Feb
Externally publishedYes

Keywords

  • Activaion energy
  • BaCe0.9Y0.1O3-d
  • Electronic structure
  • Lattice distortion
  • Proron conduction
  • Thin film

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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