Band gap evolution and piezoelectric-to-electrostrictive crossover in (1-x)KNbO3-x(Ba0.5Bi0.5)(Nb0.5Zn0.5)O3 ceramics

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. (In Press)

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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: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Departments: Arts, Computing, Engineering and Sciences > Engineering and Mathematics
Identification Number: 10.1039/C6TC05515J
Depositing User: Iasmi Sterianou
Date Deposited: 01 Feb 2017 12:02
Last Modified: 22 Mar 2017 17:35
URI: http://shura.shu.ac.uk/id/eprint/15120

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