Journal article
The role of oxygen defects on the electro-chemo-mechanical properties of highly defective gadolinium doped ceria
Publication Details
Authors: | Kabir, A.; Han, J.; Merle, B.; Esposito, V. |
Publisher: | ELSEVIER |
Publication year: | 2020 |
Journal: | Materials Letters |
Pages range : | 127490 |
Volume number: | 266 |
Number of pages: | 4 |
ISSN: | 0167-577X |
DOI-Link der Erstveröffentlichung: |
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-delta) 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. (C) 2020 Elsevier B.V. All rights reserved.
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-delta) 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. (C) 2020 Elsevier B.V. All rights reserved.
Keywords
Blocking barriers, Creep, Defects, Electrostriction, Ionic conductivity
