Correlation between electroconductive and structural properties of proton conductive acceptor-doped barium zirconate

Donglin Han, Kozo Shinoda, Shigeo Sato, Masatoshi Majima, Tetsuya Uda

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Various dopants were added to BaZrO3 and the conductivities, the proton concentrations, the site occupancy of the dopants and the change in lattice volume as a result of chemical expansion were investigated. Lanthanide group dopants occupied both the Ba and Zr sites, but the amount of these dopants in the Ba site was too limited to significantly influence the conductivity. The samples doped with Yb, Tm, Er, Y and Ho showed both high proton concentrations and high conductivities, together with a relatively large lattice expansion as a result of hydration. We therefore suggest that, in most instances, the proton concentration, proton conductivity and lattice change as a result of chemical expansion were all correlated in proton conductive acceptor-doped BaZrO3. However, Sc-doped BaZrO3 seemed to be different. Its proton concentration was high, but the conductivity and lattice change as a result of chemical expansion were relatively small. This indicates that the conductivity was strongly related to the lattice expansion resulting from hydration rather than simply the proton concentration.

Original languageEnglish
Pages (from-to)1243-1250
Number of pages8
JournalJournal of Materials Chemistry A
Volume3
Issue number3
DOIs
Publication statusPublished - 2015 Nov 14

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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