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

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...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	AIP advances 2014-01, Vol.4 (1), p.017122-017122-7
Hauptverfasser:	Quan, Ngo Duc, Hung, Vu Ngoc, Quyet, Nguyen Van, Chung, Hoang Vu, Dung, Dang Duc
Format:	Artikel
Sprache:	eng
Schlagworte:	Electronegativity Energy gap Ferroelectric materials Ferroelectricity Lithium ions Reduction Sodium Substitutes
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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.
ISSN:	2158-3226 2158-3226
DOI:	10.1063/1.4863092