Two-step sintering ceria-based electrolytes
authors Lapa, CM; de Souza, DPF; Figueiredo, FML; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Ceria; Solid electrolytes; Solid oxide fuel cells; Sintering; Microstructure
keywords GADOLINIA-DOPED CERIA; IONIC-CONDUCTIVITY; GALLIA ADDITIONS; CERAMICS; BEHAVIOR; OXIDE
abstract Yttrium and gadolinium-doped ceria-based electrolytes (20 at% dopant cation) with and without small Ga(2)O(3)-additions (0.5 mol%) were fired at peak temperatures of 1250 and 1300 degrees C, or following a two-step sintering profile including one peak temperature and subsequent dwell at 1150 degrees C, 10 h. All materials were characterized by scanning electron microscopy, X-ray diffraction and impedance spectroscopy in air, in the temperature range 200-800 degrees C. Average grain sizes in the range 150-250 nm and densifications up to about 94% were found dependent on the sintering profile and presence of Ga. The grain boundary arcs in the impedance spectra increased significantly with Ga-doping, cancelling the apparently positive role of Ga on bulk transport, evidenced mostly in the case of yttrium-doped materials. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2010
volume 35
issue 7
beginning page 2737
ending page 2741
digital object identifier (doi) 10.1016/j.ijhydene.2009.04.056
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000276692800033
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journal impact factor 4.229
5 year journal impact factor 4.064
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