Composition and Temperature Dependence of Structure and Piezoelectricity in (1−x)(K1−yNay)NbO3-x(Bi1/2Na1/2)ZrO3Lead-Free Ceramics

WANG, Dawei, HUSSAIN, Fayaz, KHESRO, Amir, FETEIRA, Antonio, TIAN, Ye, ZHAO, Quanliang, REANEY, Ian M. and ZHANG, S. (2017). Composition and Temperature Dependence of Structure and Piezoelectricity in (1−x)(K1−yNay)NbO3-x(Bi1/2Na1/2)ZrO3Lead-Free Ceramics. Journal of the American Ceramic Society, 100 (2), 627-637. (In Press)

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/jace.14...
Link to published version:: https://doi.org/10.1111/jace.14589
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    Abstract

    Lead-free piezoceramics with the composition (1-x)(K1-yNay)NbO3-x(Bi1/2Na1/2)ZrO3 (KNyN-xBNZ) were prepared using a conventional solid-state route. X-ray diffraction, Raman spectroscopy, and dielectric measurements as a function of temperature indicated the coexistence of rhombohedral (R) and tetragonal (T) phase, typical of a morphotropic phase boundary (MPB) as the BNZ concentration increased and by adjusting the K/Na ratio. High remnant polarization (Pr = 24 μC/cm2), piezoelectric coefficient (d33 = 320 pC/N), effective piezocoefficient (d33* = 420 pm/V), coupling coefficient (kp = 48%), and high strain (S = 0.168%) were obtained at room temperature, but significant deterioration of Pr, d33*, and kp were observed by increasing from room temperature to 160°C (17.5 μC/cm2, 338 pm/V, and 32%, respectively) associated with a transition to a purely T phase. Despite these compositions showing promise for room-temperature applications, the deterioration in properties as a function of increasing temperature poses challenges for device design and remains to be resolved.

    Item Type: Article
    Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
    Identification Number: https://doi.org/10.1111/jace.14589
    Page Range: 627-637
    Depositing User: Carmel House
    Date Deposited: 03 Nov 2016 10:20
    Last Modified: 16 Nov 2018 13:06
    URI: http://shura.shu.ac.uk/id/eprint/13905

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