Reactions at the calcium doped lanthanum chromite-yttria stabilized zirconia interface

J.D. Carter, C.C. Appel, Mogens Bjerg Mogensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Solid oxide fuel cell materials calcium doped lanthanum chromite (La,Ca)CrO3 and yttria stabilized zirconia (YSZ) are known to interact with each other. This interaction causes interruption of cosintering processes and the formation of secondary phases which degrade fuel cell performance. The present study shows by X-ray diffraction and microscopic analysis that Ca migrates via an exsolved Ca-Cr-O liquid phase emanating from (La,Ca)CrO3 and reacts with YSZ to obtain an intermediate layer of CaZrO3. The width of the CaZrO3 reaction region was found to increase with increasing Ca content in the exsolved Ca-Cr-O second phase. Calcium zirconate was observed to react with YSZ along the YSZ grain boundaries, eventually digesting YSZ grains into a CaZrO3 matrix. The results demonstrate the improbability of cosintering (La,Ca)CrO3 and YSZ in the presence of the Ca-Cr-O liquid phase and illustrate the importance of obtaining single phase (La,Ca)CrO3 to achieve compatibility with YSZ.
    Original languageEnglish
    JournalJournal of Solid State Chemistry
    Volume122
    Issue number2
    Pages (from-to)407-415
    ISSN0022-4596
    DOIs
    Publication statusPublished - 1996

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