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Ionic and Electronic Conductivity of Nanostructured, Samaria-Doped Ceria

Souza, E. C. C. and Chueh, W. C. and Jung, W. and Muccillo, E. N. S. and Haile, S. M. (2012) Ionic and Electronic Conductivity of Nanostructured, Samaria-Doped Ceria. Journal of the Electrochemical Society, 159 (5). K127-K135. ISSN 0013-4651.

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The ionic and electronic conductivities of samaria doped ceria electrolytes, Ce_(0.85)Sm_(0.15)O_(1.925−δ), with nanometric grain size have been evaluated. Nanostructured bulk specimens were obtained using a combination of high specific-surface-area starting materials and suitable sintering profiles under conventional, pressureless conditions. Bulk specimens with relatively high density (≥92% of theoretical density) and low medium grain size (as small as 33 nm) were achieved. Electrical A.C. impedance spectra were recorded over wide temperature (150 to 650°C) and oxygen partial pressure ranges (0.21 to 10^(−31) atm). Under all measurement conditions the total conductivity decreased monotonically with decreasing grain size. In both the electrolytic and mixed conducting regimes this behavior is attributed to the high number density of high resistance grain boundaries. The results suggest a possible variation in effective grain boundary width with grain size, as well as a possible variation in specific grain boundary resistance with decreasing oxygen partial pressure. No evidence appears for either enhanced reducibility or enhanced electronic conductivity upon nanostructuring.

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Haile, S. M.0000-0002-5293-6252
Additional Information:© 2012 The Electrochemical Society. Submitted 6 December 2011; revised 6 February 2012; published 28 February 2012. This was Paper 722 presented at the Vancouver, Canada, Meeting of the Society, April 25–30, 2010. The authors gratefully acknowledge financial support from the following agencies: the State of Sao Paulo Research Fund (FAPESP), the Brazilian National Nuclear Energy Commission (CNEN), the Brazilian National Council for Scientific and Technological Development (CNPq), and the U.S. National Science Foundation (DMR-0918224). Additional scholarship support was provided by FAPESP to E.C.C. Souza. Experimental facilities used in this work were supported the U.S National Science Foundation through the Caltech Center for the Science and Engineering of Materials, a Materials Research Science and Engineering Center (DMR-052056).
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNSPECIFIED
Comissão Nacional de Energia Nuclear (CNEN)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20120514-132428296
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Official Citation:Ionic and Electronic Conductivity of Nanostructured, Samaria-Doped Ceria E. C. C. Souza, W. C. Chueh, W. Jung, E. N. S. Muccillo, and S. M. Haile, J. Electrochem. Soc. 159, K127 (2012), DOI:10.1149/2.056205jes
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31457
Deposited By: Jason Perez
Deposited On:15 May 2012 15:58
Last Modified:03 Oct 2019 03:51

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