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Electrochemical behaviour of Co-doped LSGM perovskites prepared by sol-gel synthesis

Published online by Cambridge University Press:  01 February 2011

Riccardo Polini ,
Alessia Falsetti ,
Enrico Traversa ,
Oliver Schäf  and
Philippe Knauth
Riccardo Polini
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche - Università di Roma Tor Vergata Via della Ricerca Scientifica, 00133 ROMA, (ITALY)
Alessia Falsetti
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche - Università di Roma Tor Vergata Via della Ricerca Scientifica, 00133 ROMA, (ITALY)
Enrico Traversa
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche - Università di Roma Tor Vergata Via della Ricerca Scientifica, 00133 ROMA, (ITALY)
Oliver Schäf
Affiliation:
MADIREL (UMR 6121) Université de Provence-CNRS, Centre Saint Jérôme F-13397 Marseille Cedex 20, (FRANCE)
Philippe Knauth
Affiliation:
MADIREL (UMR 6121) Université de Provence-CNRS, Centre Saint Jérôme F-13397 Marseille Cedex 20, (FRANCE)
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Abstract

La0.8Sr0.2Ga0.8Mg0.2-xCoxO3-δ (LSGMC) powders containing different amounts of Co (x = 0.05 and 0.085) were prepared by a citrate sol-gel method. Crystalline powders were obtained by firing at 1000°C (10 h) and dense high-purity pellets were prepared by pressing (300 MPa) and sintering in air at 1475°C (5, 10 and 20 h). The sintered pellets of LSGMC were characterized by X-Ray Diffraction (XRD) Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The conductivity of sintered LSGMC pellets containing different amounts of Co ions in the B sites of the perovskite lattice was assessed by electrochemical impedance spectroscopy (EIS) in the 250–750 °C temperature range. Conductivity values and apparent activation energies were in good agreement with previously published data referring to materials with same composition, but prepared by solid-state reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K3.15
Copyright
Copyright © Materials Research Society 2005

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