Continuously controllable optical band gap in orthorhombic ferroelectric KNbO3-BiFeO3 ceramics

被引：61

作者：

Pascual-Gonzalez, Cristina ^{[1
]}

Schileo, Giorgio ^{[2
,3
]}

Murakami, Shunsuke ^{[2
]}

Khesro, Amir ^{[2
]}

Wang, Dawei ^{[2
]}

Reaney, Ian M. ^{[2
]}

Feteira, Antonio ^{[1
]}

机构：

[1] Sheffield Hallam Univ, Mat Engn & Res Inst, Sheffield S1 1WB, S Yorkshire, England

[2] Univ Sheffield, Dept Mat Sci & Engn, Mappin St, Sheffield S1 3JD, S Yorkshire, England

[3] Dyesol UK Ltd, UMIC, 48 Grafton St, Manchester M13 9XX, Lancs, England

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

Ferroelectric materials - Crystal structure - Iron compounds - Potassium compounds - X ray diffraction - Optical band gaps - Bismuth compounds - Ferroelectricity - Raman spectroscopy - Energy gap;

D O I：

10.1063/1.4982600

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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).

引用

页数：5

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