Intrinsic relationship between electronic structures and phase transition of SrBi{sub 2−x}Nd{sub x}Nb{sub 2}O{sub 9} ceramics from ultraviolet ellipsometry at elevated temperatures

Journal Article · Fri Feb 07 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4864715· OSTI ID:22278107

Duan, Z. H.; Jiang, K.; Xu, L. P.; Li, Y. W.; Chu, J. H. ^[1]

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1. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241 (China)

The ferroelectric orthorhombic to paraelectric tetragonal phase transition of SrBi{sub 2−x}Nd{sub x}Nb{sub 2}O{sub 9} (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 NbO{sub 6} octahedron and variation of hybridization between Bi 6s and O 2p states during the structure transformation.

• OSTI ID: 22278107
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CERAMICS
CONCENTRATION RATIO
CURIE POINT
ELECTRONIC STRUCTURE
ELLIPSOMETRY
ENERGY-LEVEL TRANSITIONS
FERROELECTRIC MATERIALS
LAYERS
NEODYMIUM COMPOUNDS
NIOBATES
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION