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Effect of Grain Growth on Densification and Conductivity of Ca‐Doped CeO 2 Electrolyte
Author(s) -
Yan Ming,
Mori Toshiyuki,
Zou Jin,
Drennan John
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03284.x
Subject(s) - materials science , sintering , doping , electrolyte , conductivity , grain growth , microstructure , calcination , chemical engineering , mineralogy , oxide , grain size , grain boundary , superstructure , phase (matter) , metallurgy , chemistry , electrode , optoelectronics , thermodynamics , physics , biochemistry , organic chemistry , engineering , catalysis
Doped ceria has been pursued in the past decades as a promising electrolyte material for intermediate temperature‐solid oxide fuel cells. In this study, the effects of grain growth conditions on the densification and conductivity of Ca x Ce 1− x O 2− y ( x =0.05, 0.1, and 0.2) are systematically investigated. It has been found that the densification of Ca‐doped CeO 2 depends strongly upon the specific calcination and sintering pathway, based on which the processing windows for achieving high sintering density are established. It is demonstrated that Ca‐doped CeO 2 show competing conductivities in the intermediate temperature region compared with rare earth‐doped CeO 2 . The detailed microstructures associated with various processing pathways have also been realized in terms of microdomain, superstructure, and glassy phase.