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Microstructural Evolution in a CeO2-Gd2O3 System

Published online by Cambridge University Press:  15 December 2011

Fei Ye ,
Ding Rong Ou  and
Toshiyuki Mori
Fei Ye*
Affiliation:
Key Laboratory of Materials Modification and Key Laboratory for Solar Energy Photovoltaic of Liaoning Province, School of Materials Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, Liaoning 116024, China
Ding Rong Ou
Affiliation:
Laboratory of Fuel Cells, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023, China
Toshiyuki Mori
Affiliation:
Innovation Center of Nanomaterials Science for Environment and Energy, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
*
Corresponding author. E-mail: yefei@dlut.edu.cn
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Abstract

Microstructural evolution in a CeO2-Gd2O3 system at atomic and nanoscale levels with increasing Gd concentration has been comprehensively investigated by transmission electron microscopy. When the Gd concentration was increased from 10 to 80 at.%, the phase transformation from ceria with fluorite structure to solid solution with C-type structure was not a sudden change but an evolution in the sequence of clusters, domains, and precipitates with C-type structure in the fluorite-structured matrix. Moreover, the ordering of aggregated Gd cations and oxygen vacancies in these microstructural inhomogeneities developed continuously with increasing Gd concentration. This microstructural evolution can be further described based on the development of defect clusters containing Gd cations and oxygen vacancies.

Keywords

transmission electron microscopy (TEM)microstructureorderingoxygen vacancyclustersolid oxide fuel cell
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 18 , Issue 1 , February 2012 , pp. 162 - 170
Copyright
Copyright © Microscopy Society of America 2012

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