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

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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. [Article]

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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.

More Information

Official URL:

http://pubs.rsc.org/en/Content/ArticleLanding/2017...

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

Page Range:

1990-1996

Identifiers

Identification Number:

10.1039/C6TC05515J