Zn as sintering aid for ceria-based electrolytes
authors Villas-Boas, LA; Figueiredo, FML; de Souza, DPF; Marques, FMB
nationality International
journal SOLID STATE IONICS
author keywords Ceria; Ionic conductivity; Electronic conductivity; Sintering aid; Nanopowders
keywords GRAIN-BOUNDARY CONDUCTIVITY; ELECTRICAL-PROPERTIES; MIXED CONDUCTORS; DC TECHNIQUES; CERAMICS LN; IT-SOFC; OXIDE; ZINC; GD; SM
abstract Gd-doped ceria (CGO) nanopowders were mixed with up to 1 mol% of Zn (as nitrate) to exploit the role of this dopant on sintering and electrical performance. All samples were prepared by two-step sintering schedules to try to combine the advantages of both effects on low-temperature densification. Structural and microstructural analyses were complemented with impedance spectroscopy (wide range of temperatures and oxygen partial pressures) and ion-blocking measurements. The combination of all data suggests that Zn is preferentially located in the grain boundary region, playing a significant role on sintering. Zn additions (I mol%) allowed for a 100 degrees C lower sintering temperature with respect to pure CGO. A marginal effect on the oxide-ion conductivity and a small enhancement (less than 20%) in n-type electronic conductivity was found between Zn-free and 1 mol% Zn-doped CGO. The removal of Zn from CGO after sintering is discussed. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2014
volume 262
beginning page 522
ending page 525
digital object identifier (doi) 10.1016/j.ssi.2013.11.002
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000338810500113
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journal impact factor 2.751
5 year journal impact factor 2.607
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