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    Polarization-dominated thermal-electric-mechanical behaviours in GaN ceramics

    Access Status
    Fulltext not available
    Authors
    Qin, G.S.
    Zhou, X.P.
    Wang, Y.
    Lu, Chunsheng
    Zhao, M.H.
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Qin, G.S. and Zhou, X.P. and Wang, Y. and Lu, C.S. and Zhao, M.H. 2022. Polarization-dominated thermal-electric-mechanical behaviours in GaN ceramics. Ceramics International. 48 (20): pp. 29816-29821.
    Source Title
    Ceramics International
    DOI
    10.1016/j.ceramint.2022.06.243
    ISSN
    0272-8842
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/89346
    Collection
    • Curtin Research Publications
    Abstract

    In this paper, we have systematically investigated the polarization-dependent thermal-electric-mechanical behaviours in GaN piezoelectric semiconductor ceramics (PSCs). A thermo-piezoelectric semiconductor model is proposed with pyroelectric and thermoelastic as well as piezoelectric couplings. It is shown that polarization has a non-negligible influence on the thermoelectric properties of GaN ceramics. Because the potential barrier caused by pyroelectricity near the hot end suppresses the Seebeck effect, the thermoelectric potential and current of polarized samples obviously decrease with temperature difference. Moreover, it is the intercoupling between pyroelectric polarization and piezoelectric charges that largely affects the bending strength of GaN ceramics. Compared with the ordinary ceramics, the electromechanical and thermoelectric properties of GaN PSCs can be dominated through polarization.

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