Intrinsic relationship between electronic structures and phase transition of SrBi2−xNdxNb2O9 ceramics from ultraviolet ellipsometry at elevated temperatures

The ferroelectric orthorhombic to paraelectric tetragonal phase transition of SrBi2−xNdxNb2O9 (x = 0, 0.05, 0.1, and 0.2) layer-structured ceramics has been investigated by temperature-dependent spectroscopic ellipsometry. Based on the analysis of dielectric functions from 0 to 500 °C with double Ta...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2014-02, Vol.115 (5)
Main Authors: Duan, Z H, Jiang, K, Xu, L P, Li, Y W, Hu, Z G, Chu, J H
Format: Article
Language:English
Subjects:
Applied physics
Ceramics
Curie temperature
Ferroelectric materials
Ferroelectricity
High temperature
Phase transitions
Spectroellipsometry
Temperature dependence
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The ferroelectric orthorhombic to paraelectric tetragonal phase transition of SrBi2−xNdxNb2O9 (x = 0, 0.05, 0.1, and 0.2) layer-structured ceramics has been investigated by temperature-dependent spectroscopic ellipsometry. Based on the analysis of dielectric functions from 0 to 500 °C with double Tauc-Lorentz dispersion model, the interband transitions located at ultraviolet region have shown an abrupt variation near the Curie temperature. The changes of dielectric functions are mainly due to the thermal-optical and/or photoelastic effect. Moreover, the characteristic alteration in interband transitions can be ascribed to distortion of NbO6 octahedron and variation of hybridization between Bi 6s and O 2p states during the structure transformation.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4864715