Title

Effect Of Submicron Grains On Ionic Conductivity Of Nanocrystalline Doped Ceria

Keywords

Conductivity; Doped ceria; Nanopowder

Abstract

Doped ceria has been considered for high oxygen ion conductivity for solid oxide fuel cells. In the present study, 20 mole% samarium doped nano ceria powder was prepared by wet chemical synthesis and sintered at different temperatures to retain submicron grains (>92-96% density). Ionic conductivity of the sintered pellets was measured using impedance spectroscopy as a function of temperature (200-800 °C). The total maximum conductivity was 1.0 × 10 -2S.cm -1 (at 600 °C) for samples sintered at 1200 °C. The activation energy at higher test temperature decreases with the decrease in the sintering temperature (by 25%). The grain boundary, grain interior conductivity and activation energy of the electrolyte were correlated to the resulting microstructure. It has been demonstrated that use of doped nano ceria powder as precursor not only reduced the sintering temperature but also provided segregation free grain boundary for engineering higher conductivity dense electrolytes. Copyright © 2010 American Scientific Publishers.

Publication Date

10-1-2010

Publication Title

Journal of Nanoscience and Nanotechnology

Volume

10

Issue

10

Number of Pages

6495-6503

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1166/jnn.2010.2523

Socpus ID

79955532168 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79955532168

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