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

Research output: Contribution to journalArticle

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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

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Lattice constants
Thermal expansion
thermal expansion
lattice parameters
Doping (additives)
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
conductivity
Electrolytes
microstructure
Microstructure
electrical resistivity
Cathodes
coefficients
cathodes
electrolytes
Perovskite
Cations
Positive ions
Semiconductor materials

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Influences of Ga doping on lattice parameter, microstructure, thermal expansion coefficient and electrical conductivity of La0.6Sr 0.4CoO3-y. / Matsuda, Motohide; Ihara, Kouhei; Miyake, Michihiro.

In: Solid State Ionics, Vol. 172, No. 1-4 SPEC. ISS., 31.08.2004, p. 57-61.

Research output: Contribution to journalArticle

Matsuda, Motohide ; Ihara, Kouhei ; Miyake, Michihiro. / Influences of Ga doping on lattice parameter, microstructure, thermal expansion coefficient and electrical conductivity of La0.6Sr 0.4CoO3-y. In: Solid State Ionics. 2004 ; Vol. 172, No. 1-4 SPEC. ISS. pp. 57-61.
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AB - 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.

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KW - Thermal expansion

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