The role of oxygen defects on the electro-chemo-mechanical properties of highly defective gadolinium doped ceria

Ahsanul Kabir*, Jin Kyu Han, Benoit Merle, Vincenzo Esposito

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In light of the recent discovery of giant electrostriction in defective fluorites, here we investigate the interplay between mechanical, electrochemical and electromechanical properties of oxygen defective ceria compositions (Ce1−xGdxO2−δ) as the effect of Gd-doping (x = 0.05–0.3) at low temperatures. Highly dense polycrystalline ceramics are prepared as micron-size grains with a minimized grain boundary extent. Electrochemical ionic migration by impedance spectroscopy reveals that dopant content controls the oxygen vacancies association in the samples. Interestingly, we observe that electromechanical activity is strongly controlled by the local oxygen vacancy configuration rather than on its nominal concentration. The primary creep at room temperature indicates a declining viscoelastic trend with increasing oxygen defects.
Original languageEnglish
Article number127490
JournalMaterials Letters
Volume266
Number of pages4
ISSN0167-577X
DOIs
Publication statusPublished - 2020

Keywords

  • Defects
  • Blocking barriers
  • Ionic conductivity
  • Creep
  • Electrostriction

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