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    Electric current-restrained crack propagation in brittle GaN ceramics

    Access Status
    Fulltext not available
    Authors
    Zhao, M.H.
    Umair, M.
    Lu, Chunsheng
    Qin, G.S.
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhao, M.H. and Umair, M. and Lu, C. and Qin, G.S. 2021. Electric current-restrained crack propagation in brittle GaN ceramics. Journal of Materials Science. 56 (9): pp. 5730-5735.
    Source Title
    Journal of Materials Science
    DOI
    10.1007/s10853-020-05692-2
    ISSN
    0022-2461
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/82381
    Collection
    • Curtin Research Publications
    Abstract

    © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature. The reliability of a ceramic structure or device is closely related to its faults, such as structural defects and cracks. Here, we show that cracking in piezoelectric semi-conductive ceramics (PSCs) can be restrained with the application of an electric current. Due to the crack-generated flexoelectricity, piezoelectric polarization charges that generate and gather on the front of a crack result in a strong thermoelectric effect. The phase transition and plastic deformation happened near a crack tip can hinder the propagation of the crack and even lead to its partial closure. These new findings are instructive to study the crack control and the design of PSC devices with damage tolerance.

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