High oxide-ion conductivity in acceptor-doped Bi-based perovskites at modest doping levels
A combination of impedance spectroscopy, time-of-flight secondary ion mass spectrometry and literature data are used to show that, (i) the bulk oxide ion conductivity of A-site, alkaline earth-doped BiFeO 3 (BF) is independent of the ionic radius of the alkaline earth ion (Ca, Sr, Ba) and, (ii) desp...
Saved in:
Published in | Physical chemistry chemical physics : PCCP Vol. 23; no. 19; pp. 11327 - 11333 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
England
Royal Society of Chemistry
19.05.2021
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | A combination of impedance spectroscopy, time-of-flight secondary ion mass spectrometry and literature data are used to show that, (i) the bulk oxide ion conductivity of A-site, alkaline earth-doped BiFeO
3
(BF) is independent of the ionic radius of the alkaline earth ion (Ca, Sr, Ba) and, (ii) despite very different A-site environments in (Na
1/2
Bi
1/2
)TiO
3
and BF, similar high levels and optimisation of bulk oxide ion conductivity in these Bi-based tilted perovskites is achieved at modest acceptor doping levels of ∼1-10%. These results clearly demonstrate that optimisation of oxide ion conductivity in these materials requires concepts beyond a simple crystallochemical approach based on matching the ionic radii of acceptor dopant and host lattice ions.
High oxide ion conductivity is achieved in A-site alkaline earth doped BiFeO
3
at modest levels. The similar levels of conductivity suggest oxide-ion conduction in Bi-based tilted perovskites is beyond a simple radius-based crystallochemical approach. |
---|---|
Bibliography: | 10.1039/d1cp01120k Electronic supplementary information (ESI) available. See DOI ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/d1cp01120k |