Electrical properties of sub-micrometric ceria-based electrolytes
authors Lapa, CM; Figueiredo, FMLR; Marques, FMB; de Souza, DPF
nationality International
journal SOLID STATE IONICS
author keywords Ceria; Sintering; Structure; Microstructure; Impedance spectroscopy
keywords GADOLINIA-DOPED CERIA; OXIDE FUEL-CELLS; IONIC-CONDUCTIVITY; SINTERING BEHAVIOR; SOLID ELECTROLYTES; CE0.8GD0.2O2-DELTA CERAMICS; STABILIZED ZIRCONIA; GALLIA ADDITIONS; IT-SOFC; POWDERS
abstract Sixteen different thermal profiles were used to exploit the role of thermal treatment on the structure, microstructure and electrical conductivity of yttrium- and gadolinium-doped ceria electrolytes. Samples were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and impedance spectroscopy in air. The bulk and grain boundary conductivity dependence on grain size and thermal treatment deviated from usual trends. Consistent changes in the fluorite lattice parameter with thermal history, reported here for the first time, reveal a tendency for solid solution demixing. Formation of localized concentrations of dopant cations (both in bulk and grain boundaries), explains the apparently abnormal electrical performance of these materials after prolonged thermal treatments. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2012
volume 225
beginning page 424
ending page 427
digital object identifier (doi) 10.1016/j.ssi.2012.02.018
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000311873400088
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journal analysis (jcr 2017):
journal impact factor 2.751
5 year journal impact factor 2.607
category normalized journal impact factor percentile 58.483
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