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Article
Microstructure and Grain-boundary Effect on Electrical Properties of Gadolinium-doped Ceria
Journal of the American Ceramic Society
  • X.-D. Zhou, Missouri University of Science and Technology
  • Wayne Huebner, Missouri University of Science and Technology
  • Igor Kosacki
  • Harlan U. Anderson, Missouri University of Science and Technology
Abstract
The microstructural evolution and grain-boundary influence on electrical properties of Ce0.90Gd0.10O1.95 were studied. the nanoscale powders synthesized from a semibatch reactor exhibited 50% green density and 92% sintering density at 1200°C (∼200°C lower than previous studies). Impedance spectra as a function of temperature and grain size were analyzed. the Ce0.90Gd0.10O1.95 with finest grain size possessed highest overall grain-boundary resistance; this contribution was eliminated at temperatures >600°C, regardless of grain size. the grain conductivity was independent of grain size and was dependent on temperature with two distinct regimes, indicative of the presence of Gd′Ce−Vo∘∘ complexes that dissociated at a critical temperature of ∼580°C. the activation energy for complex dissociation was ∼0.1 eV; the value for the grain-boundary was ∼1.2eV, which was size independent.
Department(s)
Materials Science and Engineering
Keywords and Phrases
  • Cerium/Cerium Compounds,
  • Grain Boundaries,
  • Conductivity,
  • Microstructure
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2004 Wiley-Blackwell, All rights reserved.
Publication Date
12-1-2004
Citation Information
X.-D. Zhou, Wayne Huebner, Igor Kosacki and Harlan U. Anderson. "Microstructure and Grain-boundary Effect on Electrical Properties of Gadolinium-doped Ceria" Journal of the American Ceramic Society (2004)
Available at: http://works.bepress.com/wayne-huebner/31/