(Invited) understanding and controlling chemo-mechanical coupling in perovskite oxides

N. H. Perry, D. Marrocchelli, S. R. Bishop, H. L. Tuller

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    3 被引用数 (Scopus)

    抄録

    Mixed ionic and electronic conducting perovskites that can readily exchange oxygen with the atmosphere exhibit a chemo-mechanical coupling between their oxygen content and their lattice dimensions. The lattice dilation accompanying oxygen loss, termed "chemical expansion," causes large chemical stresses in devices during operation that can lead to mechanical failure. This paper describes our work aimed at understanding, across multiple length scales, which factors impact chemical expansion coefficients in perovskites. Polycrystalline gallate and titanate perovskites containing multivalent Ni, Fe, and Co have been studied using in situ thermogravimetry, dilatometry, and diffraction to probe the chemical expansion process at macroscopic and crystal structure levels. Density functional theory, molecular dynamics, and empirical simulations have provided atomistic insight into changes taking place on the anion and cation sublattices during oxygen loss. Factors impacting the magnitude of the chemo-mechanical coupling, including oxygen vacancy radii, charge localization on cations, temperature, and crystal symmetry have been identified.

    本文言語英語
    ホスト出版物のタイトルMechano-Electro-Chemical Coupling in Energy Related Materials and Devices 2
    編集者S. R. Bishop, P. Mukherjee, Y.-T. Cheng, J. Rupp
    出版社Electrochemical Society Inc.
    ページ1-8
    ページ数8
    24
    ISBN(電子版)9781607687511
    ISBN(印刷版)9781623323936
    DOI
    出版ステータス出版済み - 2016
    イベントSymposium on Mechano-Electro-Chemical Coupling in Energy Related Materials and Devices 2 - 229th ECS Meeting - San Diego, 米国
    継続期間: 5 29 20166 2 2016

    出版物シリーズ

    名前ECS Transactions
    番号24
    72
    ISSN(印刷版)1938-6737
    ISSN(電子版)1938-5862

    その他

    その他Symposium on Mechano-Electro-Chemical Coupling in Energy Related Materials and Devices 2 - 229th ECS Meeting
    国/地域米国
    CitySan Diego
    Period5/29/166/2/16

    All Science Journal Classification (ASJC) codes

    • 工学(全般)

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