Anomolus shrinkage of lanthanum strontium manganite

Benjamin McCarthy, Harlan Andersen, Xaio Dong Zhou, Larry Pederson, Gregory Coffey, Prabhakar Singh

    Research output: Contribution to journalConference article

    Abstract

    Anomalous shrinkage behavior of porous Sr-doped lanthanum manganite (La 1-xSr x) 1-y MnO 3+δ, or LSM, where x = 0.0 to 0.4) has been studied as a function of thermal cycling, oxygen partial pressure, and Sr dopant concentration. An anomalous shrinkage due to thermal cycling in doped lanthanum manganite perovskite has previously been reported in the temperature range of 600°C to 1000°C. 1,2 However, the shrinkage reported here was in a 150°C range. Shrinkage of LSM during PO 2 cycling between air (2×10 5ppm O 2) and N 2 (10ppm), was much less pronounced than that of thermal cycling in the same temperature range. The two cannot be directly compared due to the difference in cycling time. The effect of Sr dopant concentration on the shrinkage due to thermal cycling reached a maximum at a dopant level of 0.1. The postulated mechanism responsible for anomalous shrinkage is the metal ion vacancy gradient produced by the oxygen nonstoichiometry of LSM. Along with this gradient or driving force for metal ion vacancy diffusion; shrinkage also requires vacancy mobility or thermal excitation to advance the anomalous shrinkage.

    Original languageEnglish
    Pages (from-to)139-149
    Number of pages11
    JournalCeramic Engineering and Science Proceedings
    Volume26
    Issue number4
    Publication statusPublished - 1 Dec 2005
    Event29th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
    Duration: 23 Jan 200528 Jan 2005

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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  • Cite this

    McCarthy, B., Andersen, H., Zhou, X. D., Pederson, L., Coffey, G., & Singh, P. (2005). Anomolus shrinkage of lanthanum strontium manganite. Ceramic Engineering and Science Proceedings, 26(4), 139-149.