Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution | Zendy

Ngo Duc Quan | Zendy; Vu Ngoc Hung | Zendy; Nguyen Van Quyet | Zendy; Hoang Vu Chung | Zendy; Đặng Đức Dũng | Zendy

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Band gap modification and ferroelectric properties of Bi0.5(Na,K)0.5TiO3-based by Li substitution

Author(s) -

Ngo Duc Quan,

Vu Ngoc Hung,

Nguyen Van Quyet,

Hoang Vu Chung,

Đặng Đức Dũng

Publication year - 2014

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4863092

Subject(s) - ferroelectricity , substitution (logic) , band gap , materials science , lithium (medication) , polarization (electrochemistry) , ion , optoelectronics , crystallography , chemistry , dielectric , organic chemistry , medicine , computer science , programming language , endocrinology

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

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