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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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Wang_et_al-2016Feteira Composition and Temperature Dependence of Structure and Piezoelectricity2.pdf - Published Version Creative Commons Attribution. Download (4MB) | Preview |
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: | 18 Mar 2021 07:47 |
| URI: | https://shura.shu.ac.uk/id/eprint/13905 |
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