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

Harumi Yokokawa; Natsuko Sakai; Tatsuya Kawada; Masayuki Dokiya

doi:10.1149/1.2086043

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

Harumi Yokokawa, Natsuko Sakai, Tatsuya Kawada, Masayuki Dokiya

Research output: Contribution to journal › Article › peer-review

155 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, La₂ZrNiO_e, 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 La_yMnO₃ has been discussed in relation to La₂Zr₂O₇ formation and manganese dissolution into YSZ cubic phases.

Original language	English
Pages (from-to)	2719-2727
Number of pages	9
Journal	Journal of the Electrochemical Society
Volume	138
Issue number	9
DOIs	https://doi.org/10.1149/1.2086043
Publication status	Published - 1991 Sept
Externally published	Yes

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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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.2086043

Cite this

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

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.",

author = "Harumi Yokokawa and Natsuko Sakai and Tatsuya Kawada and Masayuki Dokiya",

year = "1991",

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T1 - Thermodynamic Analysis of Reaction Profiles Between LaMO3(M=Ni, Co, Mn) and ZrO2

AU - Yokokawa, Harumi

AU - Sakai, Natsuko

AU - Kawada, Tatsuya

AU - Dokiya, Masayuki

PY - 1991/9

Y1 - 1991/9

N2 - 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.

AB - 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.

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