Thermodynamic Analysis of Reaction Profiles Between LaMO3(M=Ni, Co, Mn) and ZrO2

Harumi Yokokawa, Natsuko Sakai, Tatsuya Kawada, Masayuki Dokiya

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146 Citations (Scopus)

Abstract

Chemical reactions of LaMO3(M=Ni, Co, Mn) and ZrO2 have been analyzed using chemical potential diagrams for the La-Zr-M-O systems under a condition of P(O2)=1 bar. A log{a(M)/a(Zr)} vs. log{a(La)/a(Zr)} plot is appropriate for representing diffusion paths, because the layered arrangement of the reaction zone corresponds well to the geometrical configuration of stability polygons of reactants (LaMO3 and ZrO2) and products (La2Zr2O7, MO, La2ZrMO6, etc.). A complicated arrangement including a ternary perovskite phase, La2ZrNiOe, observed in the La2NiO4/YSZ couple can be represented by a simple diffusion path having the same slope in the chemcial potential diagram as in the LaCoO3/YSZ couple. The effect of lanthanum nonstoichiometry for LayMnO3 has been discussed in relation to La2Zr2O7 formation and manganese dissolution into YSZ cubic phases.

Original languageEnglish
Pages (from-to)2719-2727
Number of pages9
JournalJournal of the Electrochemical Society
Volume138
Issue number9
DOIs
Publication statusPublished - 1991 Sep

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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