Dutta, Atanu and Patra, Saheli and Bedekar, Vinila and Tyagi, A K and Basu, Rajendra Nath (2009) Nanocrystalline Gadolinium Doped Ceria: Combustion Synthesis and Electrical Characterization. Journal of Nanoscience and Nanotechnology , 9 (5). pp. 3075-3083. ISSN 1533-4880

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Twenty mol% gadolinium doped ceria powders were prepared by citrate-nitrate combustion synthesis technique. Two different sources of cerium viz. cerium nitrate and ammonium ceric nitrate were used in different oxidant-to-fuel ratios. The crystallite size of the synthesized powders ranged 5-27 nm was obtained depending on the preparation conditions with average particle size in the range 0.64-1.26 mu m. Although, the powders were found to be agglomerated in nature, these powders were highly sinter-active as they showed very high sintered density (>= 95%) when sintered at 1250 degrees C having grain size in the range of 200-500 nm. The electrical conductivity was found to depend on the temperature with two distinct regimes at a transition point of 350 degrees C. The grain boundary showed a significant role in the total conductivity with its activation energy dependent on the material preparation conditions. The activation energy of total conduction was found to be significantly low (similar to 0.5 eV) in the temperature range of 400-700 degrees C, this property is unique for application as an electrolyte for solid oxide fuel cell operating in the low temperature range. It was found that a fuel-deficient combustion reaction using cerium nitrate as the oxidant yielded the best quality powder which showed a maximum electrical conductivity of similar to 1.74 x 10(-2) S/cm at 600 degrees C.

Item Type: Article
Uncontrolled Keywords: Combustion Synthesis; Gd-Doped Ceria; Nanocrystalline; Electrical Conductivity; LT-SOFC
Subjects: Electronics
Divisions: Fuel Cell and Battery
Depositing User: Ashok K Podder
Date Deposited: 22 Feb 2012 08:53
Last Modified: 01 Apr 2016 06:15
URI: http://cgcri.csircentral.net/id/eprint/1002

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