Heterogeneous ceramics formed by grain boundary engineering
authors Ivanova, D; Lima, EMCLGP; Kovalevsky, A; Figueiredo, FML; Kharton, VV; Marques, FMB
nationality International
journal IONICS
author keywords ceria; composite electrolytes; O conductors; mixed conductors
keywords MODIFIED BARIUM-TITANATE; CORE-SHELL STRUCTURES; ELECTRICAL-PROPERTIES; MECHANICAL-PROPERTIES; IONIC-CONDUCTIVITY; OXYGEN PERMEATION; MIXED CONDUCTION; ZIRCONIA; OXIDE; MICROSTRUCTURE
abstract Two examples were selected to emphasize the potential of grain boundary engineering in the performance design of heterogeneous ceramics. Gadolinium-doped ceria-based powders were co-fired with additions of silica, and silica and lanthanum oxide, to test the silica scavenging role of lanthanum. The formation of one ionic conducting secondary phase, instead of an insulating phase, was attempted. The structural, microstructural, and electrical characterization of these samples confirmed the formation of one apatite-type lanthanum silicate-based phase and a significant enhancement of the grain boundary conductivity of these materials. One second approach addressed the formation of one mixed conductor, with electronically conductive grain boundaries, surrounding the grains of one lanthanum gallate-based electrolyte (core-shell type microstructure). Fe-doped grain boundaries were formed by selective Fe-diffusion (thermally assisted) from lanthanum ferrite screen printed layers. Combined microstructural and electrical characterization showed that the adopted solution was also effective.
publisher SPRINGER HEIDELBERG
issn 0947-7047
year published 2008
volume 14
issue 5
beginning page 349
ending page 356
digital object identifier (doi) 10.1007/s11581-008-0232-1
web of science category Chemistry, Physical; Electrochemistry; Physics, Condensed Matter
subject category Chemistry; Electrochemistry; Physics
unique article identifier WOS:000258960000001
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journal impact factor 2.347
5 year journal impact factor 2.115
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