Phase transformation in multiferroic Bi{sub 5}Ti{sub 3}FeO{sub 15} ceramics by temperature-dependent ellipsometric and Raman spectra: An interband electronic transition evidence

Journal Article · Fri Feb 28 04:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4866421· OSTI ID:22278012

Jiang, P. P.; Duan, Z. H.; Xu, L. P.; Zhang, X. L.; 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)

Thermal evolution and an intermediate phase between ferroelectric orthorhombic and paraelectric tetragonal phase of multiferroic Bi{sub 5}Ti{sub 3}FeO{sub 15} ceramic have been investigated by temperature-dependent spectroscopic ellipsometry and Raman scattering. Dielectric functions and interband transitions extracted from the standard critical-point model show two dramatic anomalies in the temperature range of 200–873 K. It was found that the anomalous temperature dependence of electronic transition energies and Raman mode frequencies around 800 K can be ascribed to intermediate phase transformation. Moreover, the disappearance of electronic transition around 3 eV at 590 K is associated with the conductive property.

• OSTI ID: 22278012
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CERAMICS
ELLIPSOMETRY
ENERGY-LEVEL TRANSITIONS
FERRITES
FERROELECTRIC MATERIALS
ORTHORHOMBIC LATTICES
PERMITTIVITY
PHASE TRANSFORMATIONS
RAMAN SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TITANIUM COMPOUNDS