Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27068
Title: Inelastic light scattering studies of diffuse phase transition in ferroelectric Sr1.9Ca0.1NaNb5O15 thin films
Authors: Liu, WC
Zhou, W
Sooryakumar, R
Mak, CL 
Keywords: Raman scattering
Brillouin scattering
Polar nanoregion
Diffuse phase transition
Issue Date: 2012
Publisher: Wiley-Blackwell
Source: Journal of raman spectroscopy, 2012, v. 43, no. 2, p. 326-330 How to cite?
Journal: Journal of Raman Spectroscopy 
Abstract: The dynamic behavior of highly oriented ferroelectric Sr1.9Ca0.1NaNb5O15 thin films has been investigated by Brillouin light scattering over a wide temperature range between 25 and 450 degrees C. The temperature variations of the full-width at half-maximum (FWHM) of the central peak (CP) are found to exhibit marked changes around the Curie temperature (Tc = 246 degrees C). The CP reveals a relaxational mode behavior, which is attributed to thermally activated fast relaxation of polar nanoregions (PNRs). The width of the CP decreases steadily upon cooling from similar to 400 degrees C to Tc and shows little subsequent change within the ferroelectric state, indicating an increase of the number of PNRs and a slowing down of their dynamics. By using a modified superparaelectric model, the activation energy (H0) of the relaxation processes and the Burns temperature (TB) are determined to be 2939 and 385 degrees C, respectively. The evidence for this diffuse phase transition provided by Brillouin scattering is in agreement with results obtained from the temperature-dependent dielectric permittivity, refractive index, and Raman spectra.
URI: http://hdl.handle.net/10397/27068
ISSN: 0377-0486
DOI: 10.1002/jrs.3018
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