Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4982600
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Funding
- SHU
- Engineering and Physical Sciences Research Council [EP/L017563/1]
- Engineering and Physical Sciences Research Council [EP/L017563/1] Funding Source: researchfish
- EPSRC [EP/L017563/1] Funding Source: UKRI
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The optical bandgap of orthorhombic ferroelectric KNbO3 is shown to be continuously controllable via Bi and Fe co-substitution according to a K1-xBixNb1-xFexO3 doping mechanism. The 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 (similar to 33%). In-situ Raman spectroscopy corroborates the polar nature of all compositions in the temperature range of -100 to 200 degrees C. The ability to control the bandgap while maintaining the spontaneous polarisation makes the K1-xBixNb1-xFexO3 system interesting for photoinduced processes in a wide temperature range. (C) 2017 Author(s).
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