Compositional and structural characteristics of nano-sized domains in gadolinium-doped ceria

Nano-sized domains were studied systematically in 10–30 at.% Gd-doped ceria. By using energy filtering transmission electron microscopy, it was observed that Gd cations could segregate in the domains. Due to the requirement of electrical neutrality, oxygen vacancies may also segregate into the domai...

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Bibliographic Details
Published in:Solid state ionics 2008-09, Vol.179 (21), p.827-831
Main Authors: Ye, Fei, Mori, Toshiyuki, Ou, Ding Rong, Zou, Jin, Auchterlonie, Graeme, Drennan, John
Format: Article
Language:English
Subjects:
Ceria
Microstructure
Ordering of oxygen vacancies
TEM
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Summary:Nano-sized domains were studied systematically in 10–30 at.% Gd-doped ceria. By using energy filtering transmission electron microscopy, it was observed that Gd cations could segregate in the domains. Due to the requirement of electrical neutrality, oxygen vacancies may also segregate into the domains with the dopant cations. Through study of electron energy loss spectroscopy, the local ordering of oxygen vacancies in the domains was further confirmed. Furthermore, the nano-sized domains and the local ordering develop with increasing doping concentration. Based on the experimental results, the formation mechanism of the domains and their effect on the ionic conductivity are discussed.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2008.02.034