Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution
oleh: Ngo Duc Quan, Vu Ngoc Hung, Nguyen Van Quyet, Hoang Vu Chung, Dang Duc Dung
| Format: | Article |
|---|---|
| Diterbitkan: | AIP Publishing LLC 2014-01-01 |
Deskripsi
We report on the reduction of band gap in Bi0.5(Na0.82-xLixK0.18)0.5(Ti0.95Sn0.05)O3 from 2.99 eV to 2.84 eV due to the substitutions of Li+ ions to Na+ sites. In addition, the lithium substitution samples exhibit an increasing of the maximal polarizations from 21.8 to 25.7 μC/cm2. The polarization enhancement of ferroelectric and reduction of the band gaps are strongly related to the Li substitution concentration as evaluated via the electronegative between A-site and oxygen and tolerance factor. The results are promising for photovoltaic and photocatalytic applications.