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

Ngo Duc Quan; Vu Ngoc Hung; Nguyen Van Quyet; Hoang Vu Chung; Dang Duc Dung

doi:10.1063/1.4863092

AIP Advances (Jan 2014)

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

Ngo Duc Quan,
Vu Ngoc Hung,
Nguyen Van Quyet,
Hoang Vu Chung,
Dang Duc Dung

Affiliations

Ngo Duc Quan: Department of General Physics, School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam
Vu Ngoc Hung: International Training Institute for Materials Science, Hanoi University of Science and Technology, 1 Dai Co Viet road, Hanoi, Vietnam
Nguyen Van Quyet: Hanautech Co., Ltd., 832, Tamnip-dong, Yuseong-gu, Daejeon, Republic of Korea
Hoang Vu Chung: Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Hanoi, Vietnam
Dang Duc Dung: Department of General Physics, School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam

DOI: https://doi.org/10.1063/1.4863092
Journal volume & issue: Vol. 4, no. 1
pp. 017122 – 017122-7

Abstract

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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.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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