Continuously controllable optical band gap in orthorhombic ferroelectric KNbO3-BiFeO3 ceramics

PASCUAL-GONZALEZ, Cristina, SCHILEO, Giorgio, MURAKAMI, Shunsuke, KHESRO, Amir, WANG, Dawei, REANEY, Ian and FETEIRA, Antonio (2017). Continuously controllable optical band gap in orthorhombic ferroelectric KNbO3-BiFeO3 ceramics. Applied Physics Letters, 110 (17).

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Official URL: https://aip.scitation.org/doi/10.1063/1.4982600
Open Access URL: https://aip.scitation.org/doi/pdf/10.1063/1.498260...
Link to published version:: https://doi.org/10.1063/1.4982600

Abstract

The optical band gap of orthorhombic ferroelectric KNbO3 is shown to be continuously controllable via Bi and Fe co-substitution according to a K1-xBixNb1-xFexO3 doping mechanism. Room temperature X-ray diffraction data combined with Raman spectroscopy analysis show the polar orthorhombic crystal structure to persist up to x=0.25, while the bandgap narrows monotonically by 1 eV (~33%). In-situ Raman spectroscopy corroborates the polar nature of all compositions in the temperature range -100 to 200 C. The ability to control the band gap while maintaining the spontaneous polarisation makes the K1-xBixNb1-xFexO3 system interesting for photoinduced processes in a wide temperature range.

Item Type: Article
Departments: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Identification Number: https://doi.org/10.1063/1.4982600
Depositing User: Antonio Feteira
Date Deposited: 27 Apr 2017 09:08
Last Modified: 29 Oct 2018 16:00
URI: http://shura.shu.ac.uk/id/eprint/15610

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