Investigations of Low Temperature Phase Transitions in BiFeO sub(3) Ceramic by Infrared Spectroscopy

In this paper, results of new infrared FIR-MIR measurements (wavenumber range of 4000-100 cm super(-1)) in the range of the temperature 300 [divide] 8 K of the BiFeO sub(3) ceramic are presented. Below 200 K only one symmetric band at ca. 800 cm super(-1) is visible. The full width at half maximum o...

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Bibliographic Details
Published in:Ferroelectrics 2011-01, Vol.417 (1), p.63-69
Main Authors: Bujakiewicz-Koronska, R, Hetmanczyk, L, Garbarz-Glos, B, Budziak, A, Koronski, J, Hetmanczyk, J, Antonova, M, Kalvane, A, Nalecz, D
Format: Article
Language:English
Subjects:
Bands
Ceramics
Cooling
Ferroelectric materials
Infrared
Infrared spectroscopy
Phase transformations
Shoulders
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Summary:In this paper, results of new infrared FIR-MIR measurements (wavenumber range of 4000-100 cm super(-1)) in the range of the temperature 300 [divide] 8 K of the BiFeO sub(3) ceramic are presented. Below 200 K only one symmetric band at ca. 800 cm super(-1) is visible. The full width at half maximum of this band decreases exponentially on cooling. The shape of the band at ca. 545 cm super(-1)connected with A1 (TO) mode also changes between 60-40 K, this is in the vicinity of the phase transition at 50 K. Initially a broad band reveals its components as shoulder bands. Theirs FWHM decrease with cooling.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2011.578495