Direct evidence of dopant segregation in Gd-doped ceria

Li, Zhi-Peng, Mori, Toshiyuki, Auchterlonie, Graeme John, Zou, Jin and Drennan, John (2011) Direct evidence of dopant segregation in Gd-doped ceria. Applied Physics Letters, 98 9: 093104.1-093104.3. doi:10.1063/1.3556650

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Author Li, Zhi-Peng
Mori, Toshiyuki
Auchterlonie, Graeme John
Zou, Jin
Drennan, John
Title Direct evidence of dopant segregation in Gd-doped ceria
Journal name Applied Physics Letters   Check publisher's open access policy
ISSN 0003-6951
Publication date 2011-02
Sub-type Article (original research)
DOI 10.1063/1.3556650
Open Access Status File (Publisher version)
Volume 98
Issue 9
Start page 093104.1
End page 093104.3
Total pages 3
Place of publication College Park, MD, United States
Publisher American Institute of Physics
Collection year 2012
Language eng
Abstract Microstructures and segregations of dopants and associated oxygen vacancies in gadolinium-doped ceria (GDC) have been characterized by high-resolution transmission electron microscopy (HRTEM) and scanning TEM (STEM). Diffuse scattering was detected in 25 at. % GDC (25GDC) in comparison to 10GDC, which is ascribed to nanodomain formation in 25GDC. HRTEM, dark-field, and STEM Z-contrast imaging investigations all provide direct evidence for dopant segregation in doped ceria. It is illustrated that dopant cations cannot only segregate in grain interior forming larger nanodomains but also at grain boundary forming smaller ones. Detailed analyses about nanodomain formation and related dopant segregation behaviors are then elucidated.
Keyword Grain boundaries
Solid electrolytes
Solute segregation
Space charge
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article no. 093104

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