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PASCUAL-GONZALEZ, Cristina, SCHILEO, Giorgio, KHESRO, Amir, STERIANOU, Iasmi, WANG, Dawei, REANEY, Ian and FETEIRA, Antonio (2017). Band gap evolution and piezoelectric-to-electrostrictive crossover in (1-x)KNbO3-x(Ba0.5Bi0.5)(Nb0.5Zn0.5)O3 ceramics. Journal of Materials Chemistry C, 5 (8), 1990-1996.
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Feteira-BandGapEvolutionAndPieZoElectric(VoR).pdf - Published Version Creative Commons Attribution. Download (2MB) | Preview |
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Abstract
The band gap of (1-x)KNbO3-x(Ba0.5Bi0.5)(Nb0.5Zn0.5)O3 (0≤x≤0.25) ceramics narrows slightly from 3.22 eV for x=0 to 2.89 eV for x=0.25, in broad agreement with first-principle calculations [Phys. Rev. B 89, 235105 (2014)]. In addition, an unreported piezoelectric-to-electrostrictive crossover is observed in this compositional range, which is accompanied by a continuous decrease of the maximum electric field-induced strain due to the presence of a non-ferroelectric phase. An electrostriction coefficient of 0.023 m4/C2 is measured for x=0.05, whilst no electromechanical response is observed for non-ferroelectric x=0.25, even under an applied electric field of 80 kV/cm.
| 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 |
| Departments - Does NOT include content added after October 2018: | Faculty of Science, Technology and Arts > Department of Engineering and Mathematics |
| Identification Number: | https://doi.org/10.1039/C6TC05515J |
| Page Range: | 1990-1996 |
| Depositing User: | Iasmi Sterianou |
| Date Deposited: | 01 Feb 2017 12:02 |
| Last Modified: | 18 Mar 2021 11:19 |
| URI: | https://shura.shu.ac.uk/id/eprint/15120 |
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