Protonic defects in pure and doped La2Zr2O7 pyrochlore oxide

Mårten Björketun, Christopher S. Knee, B. Joakim Nyman, Göran Wahnström

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Densi ty- functional calculations have been used to study protonic defects in stoichiometric and substituted La2Zr2O7 pyrochlore oxide. The preferred proton sites have been pinpointed in the stoichiometric material and their relative stability determined. Based on these results a continuous migration pathway that enables long-range transport is proposed. In addition, the interaction energies between protons and divalent Ba, Sr, Ca, and Mg dopants located on the La- and Zr-sites have been calculated. All interactions are found to be attractive; they are strong in the case of Ba and Mg and quite weak for Sr and Ca suggesting that samples acceptor doped with the latter two ions should show the highest proton conductivity.
Original languageEnglish
JournalSolid State Ionics
Volume178
Issue number31-32
Pages (from-to)1642-1647
ISSN0167-2738
DOIs
Publication statusPublished - 2008

Keywords

  • point defects
  • DFT
  • defect clusters
  • proton conductors
  • first-principles calculations
  • La2Zr2O7
  • pyrochlore oxides

Cite this

Björketun, M., Knee, C. S., Nyman, B. J., & Wahnström, G. (2008). Protonic defects in pure and doped La2Zr2O7 pyrochlore oxide. Solid State Ionics, 178(31-32), 1642-1647. https://doi.org/10.1016/j.ssi.2007.10.014