Abstract
Lattice parameters, microstructures, thermal expansion coefficients and electrical conductivities of Ga-doped La0.6Sr0.4CoO 3-y were investigated in order to characterize influences of interdiffusion of Ga from La(Sr)Ga(Mg)O3-y electrolyte into La 0.6Sr0.4CoO3-y cathode in intermediate temperature solid oxide fuel cell. Unknown phases were formed when the amount of Ga doped was beyond 20% of B-site cation in the perovskite structure. In the single-phase region, the lattice parameters and thermal expansion coefficients were increased with the Ga doping. The thermal expansion coefficient increases were much higher than those of La(Sr)Ga(Mg)O3-y electrolyte. The electrical conductivities decreased with an increase in the doped amount of Ga, and the electrical conduction changed from metallic to semiconductor-like with the Ga doping. Those results clearly indicate that the interdiffusion of Ga into La0.6Sr0.4CoO3-y cathode has unfavorable influences on the physicochemical properties of La0.6Sr 0.4CoO3-y in the intermediate temperature solid oxide fuel cell.
Original language | English |
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Pages (from-to) | 57-61 |
Number of pages | 5 |
Journal | Solid State Ionics |
Volume | 172 |
Issue number | 1-4 SPEC. ISS. |
DOIs | |
Publication status | Published - Aug 31 2004 |
Keywords
- Electrical properties
- Electrode
- Interfacial reaction
- SOFC
- Thermal expansion
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics