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    Structural Evolution of the R-T Phase Boundary in KNN-Based Ceramics

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    Type
    Article
    Authors
    Lv, Xiang
    Wu, Jiagang cc
    Xiao, Dingquan
    Zhu, Jianguo
    Zhang, Xixiang cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-10-20
    Online Publication Date
    2017-10-20
    Print Publication Date
    2018-03
    Permanent link to this record
    http://hdl.handle.net/10754/626030
    
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    Abstract
    Although a rhombohedral-tetragonal (R-T) phase boundary is known to substantially enhance the piezoelectric properties of potassium-sodium niobate ceramics, the structural evolution of the R-T phase boundary itself is still unclear. In this work, the structural evolution of R-T phase boundary from -150 °C to 200 °C is investigated in (0.99-x)K0.5Na0.5Nb1-ySbyO3-0.01CaSnO3-xBi0.5K0.5HfO3 (where x=0~0.05 with y=0.035, and y=0~0.07 with x=0.03) ceramics. Through temperature-dependent powder X-ray diffraction (XRD) patterns and Raman spectra, the structural evolution was determined to be Rhombohedral (R, <-125 °C) → Rhombohedral+Orthorhombic (R+O, -125 °C to 0 °C) → Rhombohedral+Tetragonal (R+T, 0 °C to 150 °C) → dominating Tetragonal (T, 200 °C to Curie temperature (TC)) → Cubic (C, >TC). In addition, the enhanced electrical properties (e.g., a direct piezoelectric coefficient (d33) of ~450±5 pC/N, a conversion piezoelectric coefficient (d33*) of ~580±5 pm/V, an electromechanical coupling factor (kp) of ~0.50±0.02, and TC~250 °C), fatigue-free behavior, and good thermal stability were exhibited by the ceramics possessing the R-T phase boundary. This work improves understanding of the physical mechanism behind the R-T phase boundary in KNN-based ceramics and is an important step towards their adoption in practical applications. This article is protected by copyright. All rights reserved.
    Citation
    Lv X, Wu J, Xiao D, Zhu J, Zhang X (2017) Structural evolution of the R-T phase boundary in KNN-based ceramics. Journal of the American Ceramic Society 101: 1191–1200. Available: http://dx.doi.org/10.1111/jace.15266.
    Sponsors
    National Science Foundation of China, Grant/Award Number: 51722208, 51332003, 51272164; King Abdullah University of Science and Technology (KAUST)
    Publisher
    Wiley
    Journal
    Journal of the American Ceramic Society
    DOI
    10.1111/jace.15266
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1111/jace.15266/abstract
    ae974a485f413a2113503eed53cd6c53
    10.1111/jace.15266
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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