Composite cathode materials were prepared by mixing La0.83Sr0.17Ga0.83Mg0.17O2.83 (LSGM) and La0.8Sr0.2MnO3 (LSM) powders fired at 1300 °C. Several compositions were set up containing 1, 5, 25, 50, 75 wt.% of LSM. Their microstructure and electrical behaviour were investigated by XRPD, SEM/EDS and EIS. In composites containing 50 and 75 wt.% of LSM, the electronic contribution to conductivity is predominant, then there is only a single point at the low frequency end of the Nyquist plot. On the contrary, in the composites with up to 25 wt.% of LSM, there is a significant amount of ionic transport, then the IS spectra show complex features: at least three different arcs can be devised and their interpretation depends upon temperature. LSGM bulk and grain boundary conductivity, as well as interface polarization between the ionic (LSGM) and electronic (LSM) phases can be separated at temperatures below 600 °C; total LSGM contribution, i.e. bulk plus grain boundary, LSGM–LSM interface and electrode polarizations are attributed above 600 °C.

(2006). Electrical behaviour of LSGM-LSM composite cathode materials [journal article - articolo]. In SOLID STATE IONICS. Retrieved from http://hdl.handle.net/10446/20131

Electrical behaviour of LSGM-LSM composite cathode materials

PELOSATO, Renato;NATALI SORA, Isabella
2006-01-01

Abstract

Composite cathode materials were prepared by mixing La0.83Sr0.17Ga0.83Mg0.17O2.83 (LSGM) and La0.8Sr0.2MnO3 (LSM) powders fired at 1300 °C. Several compositions were set up containing 1, 5, 25, 50, 75 wt.% of LSM. Their microstructure and electrical behaviour were investigated by XRPD, SEM/EDS and EIS. In composites containing 50 and 75 wt.% of LSM, the electronic contribution to conductivity is predominant, then there is only a single point at the low frequency end of the Nyquist plot. On the contrary, in the composites with up to 25 wt.% of LSM, there is a significant amount of ionic transport, then the IS spectra show complex features: at least three different arcs can be devised and their interpretation depends upon temperature. LSGM bulk and grain boundary conductivity, as well as interface polarization between the ionic (LSGM) and electronic (LSM) phases can be separated at temperatures below 600 °C; total LSGM contribution, i.e. bulk plus grain boundary, LSGM–LSM interface and electrode polarizations are attributed above 600 °C.
journal article - articolo
2006
Dotelli, Giovanni; Mari, CLAUDIO MARIA; Ruffo, Riccardo; Pelosato, Renato; NATALI SORA, Isabella
(2006). Electrical behaviour of LSGM-LSM composite cathode materials [journal article - articolo]. In SOLID STATE IONICS. Retrieved from http://hdl.handle.net/10446/20131
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/20131
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