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). [Article]

Documents
15610:515916
[thumbnail of 1.pdf]
Preview
PDF
1.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview
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.
More Information
Statistics

Downloads

Downloads per month over past year

View more statistics

Metrics

Altmetric Badge

Dimensions Badge

Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email

Actions (login required)

View Item View Item