Composition and temperature dependence of structure and piezoelectricity in (1−x)(K1−yNay)NbO3-x(Bi1/2Na1/2)ZrO3 lead-free ceramics

WANG, Dawei, HUSSAIN, Fayaz, KHESRO, Amir, FETEIRA, Antonio, TIAN, Ye, ZHAO, Quanliang and REANEY, Ian (2016). Composition and temperature dependence of structure and piezoelectricity in (1−x)(K1−yNay)NbO3-x(Bi1/2Na1/2)ZrO3 lead-free ceramics. Journal of the American Ceramic Society. (In Press)

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

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: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1111/jace.14589
Depositing User: Antonio Feteira
Date Deposited: 17 Nov 2016 17:23
Last Modified: 14 Jun 2017 19:54
URI: http://shura.shu.ac.uk/id/eprint/13871

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  • Composition and temperature dependence of structure and piezoelectricity in (1−x)(K1−yNay)NbO3-x(Bi1/2Na1/2)ZrO3 lead-free ceramics. (deposited 17 Nov 2016 17:23) [Currently Displayed]

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