NDLI: Influence of microstructure on oxide ionic conductivity in doped CeO$

Content Provider	Springer Nature Link
Author	Mori, Toshiyuki Drennan, John
Copyright Year	2006
Abstract	Doped ceria (CeO$_{2}$) compounds are fluorite type oxides, which show oxide ionic conductivity higher than yttria stabilized zirconia, in oxidizing atmospheres. As a consequence of this, considerable interest has been shown in application of these materials for `low (500$^{∘}$–650$^{∘}$C)’ temperature operation of solid oxide fuel cells (SOFCs). In this study, some rare earth (eg. Gd, Sm, and Dy) doped CeO$_{2}$ nano-powders were synthesized via a carbonate co-precipitation method. Fluorite-type solid solution were able to be formed at low temperature, such as 400$^{∘}$C and dense sintered bodies were subsequently fabricated in the temperature ranging from 1000$^{∘}$ to 1450$^{∘}$C by conventional sintering (CS) method. To develop high quality solid electrolytes, the microstructure at the atomic level of these doped CeO$_{2}$ solid electrolytes were examined using transmission electron microscopy (TEM). The specimens obtained by CS had continuous and large micro-domains with a distorted pyrochlore structure or related structure, within each grain. We conclude that the conducting properties in these doped CeO$_{2}$ systems are strongly influenced by the micro-domain size in the grain. To minimize the micro-domain size, spark plasma sintering (SPS) was examined. SPS has not been used to fabricate dense sintered bodies of doped CeO$_{2}$ electrolytes, previously; carbon from the graphite dies penetrates the specimens and inhibits densification. To overcome this challenge, and to be able to produce dense sintered bodies of doped CeO$_{2}$ of a grain size that minimizes the microdomain growth, a combination of SPS and CS methods were examined. Using this combined method we report that we were able to produce fully dense specimens with improved conductivity. This is correlated with a reduction in the size of the micro-domains. Consequently we conclude that the control of micro-domain size within the grain structure is a key component in the successful design of electrolyte materials with improved conductivity.
Starting Page	749
Ending Page	757
Page Count	9
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	17
Issue Number	2-4
e-ISSN	15738663
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Doped CeO$_{2}$ Oxide ionic conductivity Micro-domain Spark plasma sintering Low temperature operation of fuel cells application Electrochemistry Optical and Electronic Materials Characterization and Evaluation Materials Ceramics, Glass, Composites, Natural Methods Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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