Characterization of Ln0.5M0.5FeO3-δ (Ln = La, Nd, Sm; M = Ba, Sr) perovskites as SOFC cathodes

A. Ecija, K. Vidal, A. Larrañaga, A. Martínez-Amesti, L. Ortega-San-Martín, M. I. Arriortua

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

25 Citas (Scopus)

Resumen

Ln0.5M0.5FeO3-δ (Ln = La, Nd, Sm; M = Ba, Sr) perovskites have been synthesised by the glycine-nitrate route in order to obtain compounds with good morphological and electrical characteristics to be used as SOFC cathodes. A systematic study of the influence of the average ionic radius of the A cation (), on the structural, morphological and electrical properties of these perovskites has been performed. The obtained materials have been characterised by ICP-AES analysis, X-ray powder and neutron powder diffraction, scanning electron microscopy and four-probe conductivity measurements. In this study has been changed in the range 1.34 ≥ ≥ 1.25 Å, while keeping constant the doping level, x = 0.5 (in A position) and A cation size disorder, σ2 (rA) = 0.0161 Å2. Overall, the sample with the higher average ionic radius showed the highest values of conductivity. Chemical compatibility of the proposed cathodes with yttria-stabilised zirconia electrolyte (YSZ) has also been analysed. The data indicate that additional phase formations exist in all systems at temperatures above ~ 1000 °C. © 2011 Elsevier B.V. All rights reserved.
Idioma originalEspañol
Páginas (desde-hasta)35-41
Número de páginas7
PublicaciónSolid State Ionics
Volumen201
EstadoPublicada - 19 oct. 2011

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