NDLI: Impedance spectroscopy study of gadolinia-doped ceria

Content Provider	Springer Nature Link
Author	Zhu, Bin Albinsson, I. Mellander, B. E.
Copyright Year	1999
Abstract	The electrical properties of Gd$_{0.1}$Ce$_{0.9}$O$_{1.95}$ were investigated in various gas atmospheres using a.c. impedance spectroscopy. In dry oxygen, impedance spectra consisted of two arcs at low temperatures corresponding to bulk and grain boundary behaviour, respectively, and only one arc at high temperatures (T>550 °C). The results showed a high oxygen ion conductivity in oxygen atmosphere more than 10$^{−2}$ S/cm at 600 °C. In water atmospheres, the bulk arc in dry oxygen was reduced by 30 %, and an additional arc corresponding to the grain boundary effect appeared. It seems that the presence of water may decrease the bulk resistance, but causes an additional grain boundary resistance and thus increase in the total resistance. In hydrogen atmosphere, a conductivity enhancement up to one order of magnitude was observed. In hydrogen there is a reduction of Ce$^{4+}$ to Ce$^{3+}$ in the sample, which involves defect formation generating e.g. electrons, additional oxygen vacancies and at the same time protons in the lattice. These new charge carriers are responsible for a significant conductivity enhancement. Therefore, in a hydrogen atmosphere the material is a mixed (oxygen ion + proton + electron) conductor.
Starting Page	286
Ending Page	291
Page Count	6
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	5
Issue Number	3-4
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biomedicine general Analytical Chemistry Physical Chemistry Electrochemistry Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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