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    Coexisting multi-phase and relaxation behavior in high-performance lead-free piezoceramics

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    Embargo End Date:
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    Type
    Article
    Authors
    Lv, Xiang
    Ma, Yinchang cc
    Zhang, Junwei
    Liu, Yao cc
    Li, Fei
    Zhang, Xixiang cc
    Wu, Jiagang
    KAUST Department
    Material Science and Engineering
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    Date
    2022-08-04
    Embargo End Date
    2024-08-04
    Permanent link to this record
    http://hdl.handle.net/10754/680262
    
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    Abstract
    Phase boundary engineering (PBE) has remarkably enhanced the piezoelectric properties of potassium sodium niobate {(K, Na)NbO3, KNN} piezoceramics, yet the physical mechanisms need to be further understood. Here we outline a new physical phenomenon to describe piezoelectricity enhancement in KNN-based ceramics with PBE. We propose that the enhancement is due to the multi-phase coexistence featured with strong relaxation behavior. The strong relaxation behavior was unambiguously revealed by cryogenic experiments and originated from the polar nanoregions (PNRs) exhibiting a scale of 2.1 nm and a weak tetragonality (c/a = 1.0040). in situ temperature-dependent experiments uncovered the thermal evolution of the ferroelectric matrix and PNRs in both unpoled and poled samples, the first report in KNN-based ceramics. Our experiments combined with phenomenological theory revealed that ultra-fine nanodomains, PNRs, and easy polarization rotation together promote macro dielectric and piezoelectric properties in the relaxation-featured multi-phase coexistence. This work reveals the physical mechanism from different levels (e.g., local-mesoscopic-macroscopic), thus providing a new systematic understanding of the observed enhancement of piezoelectricity.
    Citation
    Lv, X., Ma, Y., Zhang, J., Liu, Y., Li, F., Zhang, X., & Wu, J. (2022). Coexisting multi-phase and relaxation behavior in high-performance lead-free piezoceramics. Acta Materialia, 238, 118221. https://doi.org/10.1016/j.actamat.2022.118221
    Sponsors
    This work is supported by the National Natural Science Foundation of China (Grant Nos. 52061130216, 52032007, and 52002252), the Central Funds Guiding the Local Science and Technology Development of Sichuan Province (2021ZYD0022), the Fundamental Research Funds for the Central Universities (YJ2021154), and Chengdu International Science and Technology Cooperation Project (2021-GH03-00003-HZ). The Royal Society is appreciated for a Newton Advanced Fellowship award (NAF\R1\201126). We thank Ms. Hui Wang (Analytical & Testing Center of Sichuan University) for measuring SEM images.
    Publisher
    Elsevier BV
    Journal
    Acta Materialia
    DOI
    10.1016/j.actamat.2022.118221
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1359645422006012
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.actamat.2022.118221
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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