Influences of Ga doping on lattice parameter, microstructure, thermal expansion coefficient and electrical conductivity of La0.6Sr 0.4CoO3-y

Motohide Matsuda, Kouhei Ihara, Michihiro Miyake

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23 Citations (Scopus)

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 languageEnglish
Pages (from-to)57-61
Number of pages5
JournalSolid State Ionics
Volume172
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - Aug 31 2004

Keywords

  • Electrical properties
  • Electrode
  • Interfacial reaction
  • SOFC
  • Thermal expansion

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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