Grain boundary conductivity of heterogeneous ceria gadolinia
authors Tanaka, R; Oliveira, WS; Brandao, A; Abrantes, JCC; Frade, JR
nationality International
journal ELECTROCHIMICA ACTA
author keywords CGO; Heterogeneous doping; Grain boundary conductivity; Electrolytes
keywords IONIC-CONDUCTIVITY; DOPED CERIA; SINTERING TEMPERATURE; SOLID-SOLUTIONS; CERAMICS; ZIRCONIA; BULK; ELECTROLYTES; IMPROVEMENT; CO
abstract Additions of excess of Gd were used to demonstrate that designed heterogeneities may yield enhanced grain boundary conductivity of ceria-gadolinia ceramic samples sintered at temperatures from 1400 degrees C to 1500 degrees C. Additions of excess of Ce play negative effects. Microstructural contributions of the overall electrical behavior were de-convoluted by electrochemical impedance spectroscopy. Though the bulk conductivity is nearly independent of sintering temperature and almost insensitive to compositional heterogeneities, the specific grain boundary conductivity shows strong dependence on these two factors. Estimates of grain boundary thickness indicate that sintered samples retain compositional heterogeneities with significant effects on space charge potentials. (C) 2012 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2012
volume 85
beginning page 116
ending page 121
digital object identifier (doi) 10.1016/j.electacta.2012.08.009
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000314376000017
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 5.116
5 year journal impact factor 4.857
category normalized journal impact factor percentile 83.929
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg