Solubility limits and LaGaO3 compatibility in the LaO1.5-GaO1.5-NiO ternary system

Patrick K. Duffy, Rachel A. Beal, Carys E. Layton, Scott A. Barnett, Thomas O Mason

Research output: Contribution to journalArticle

Abstract

Phase compatibility and solubility limits in the LaO1.5-GaO1.5-NiO system at 1400°C were measured using phase analysis and disappearing phase methods, focusing on compatibility of LaGaO3 with NiO and Lan+1NinO3n+1 Ruddlesden-Popper phases. For the first time, it was observed that, similar to La4Ni3O10, the incorporation of gallium stabilized La3Ni2O7 over a narrow composition range. The compositional limits of stability involving LaGaO3 were determined in detail, and the full quasiternary diagram is presented as a best estimation that is consistent with the observations of this study. LaGaO3 showed compatibility with NiO, with gallium and nickel substituting for each other in both phases. The lowest attainable amount of nickel in LaGaO3 in equilibrium with gallium-saturated NiO was measured to be around 7% nickel on gallium sites. Of the Ruddlesden-Popper phases, only La4Ni3O10 showed compatibility with LaGaO3, with the two-phase region spanning between ~40%-55% gallium on nickel sites in La4Ni3O10 and ~20%-50% nickel on gallium sites in LaGaO3. The electrical conductivity of La4(Ni1−xGax)3O10 was also measured, and found to decrease monotonically with the addition of gallium. Implications relating to fabrication of solid oxide fuel cells with Sr- and Mg-doped LaGaO3 electrolytes are discussed.

Original languageEnglish
Pages (from-to)1682-1688
Number of pages7
JournalJournal of the American Ceramic Society
Volume100
Issue number4
DOIs
Publication statusPublished - Apr 1 2017

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Gallium
Ternary systems
Solubility
Nickel
Solid oxide fuel cells (SOFC)
Electrolytes
Fabrication
Chemical analysis

Keywords

  • phase diagrams
  • phase equilibria
  • solid oxide fuel cell

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Solubility limits and LaGaO3 compatibility in the LaO1.5-GaO1.5-NiO ternary system. / Duffy, Patrick K.; Beal, Rachel A.; Layton, Carys E.; Barnett, Scott A.; Mason, Thomas O.

In: Journal of the American Ceramic Society, Vol. 100, No. 4, 01.04.2017, p. 1682-1688.

Research output: Contribution to journalArticle

Duffy, Patrick K. ; Beal, Rachel A. ; Layton, Carys E. ; Barnett, Scott A. ; Mason, Thomas O. / Solubility limits and LaGaO3 compatibility in the LaO1.5-GaO1.5-NiO ternary system. In: Journal of the American Ceramic Society. 2017 ; Vol. 100, No. 4. pp. 1682-1688.
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AB - Phase compatibility and solubility limits in the LaO1.5-GaO1.5-NiO system at 1400°C were measured using phase analysis and disappearing phase methods, focusing on compatibility of LaGaO3 with NiO and Lan+1NinO3n+1 Ruddlesden-Popper phases. For the first time, it was observed that, similar to La4Ni3O10, the incorporation of gallium stabilized La3Ni2O7 over a narrow composition range. The compositional limits of stability involving LaGaO3 were determined in detail, and the full quasiternary diagram is presented as a best estimation that is consistent with the observations of this study. LaGaO3 showed compatibility with NiO, with gallium and nickel substituting for each other in both phases. The lowest attainable amount of nickel in LaGaO3 in equilibrium with gallium-saturated NiO was measured to be around 7% nickel on gallium sites. Of the Ruddlesden-Popper phases, only La4Ni3O10 showed compatibility with LaGaO3, with the two-phase region spanning between ~40%-55% gallium on nickel sites in La4Ni3O10 and ~20%-50% nickel on gallium sites in LaGaO3. The electrical conductivity of La4(Ni1−xGax)3O10 was also measured, and found to decrease monotonically with the addition of gallium. Implications relating to fabrication of solid oxide fuel cells with Sr- and Mg-doped LaGaO3 electrolytes are discussed.

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