Copy For Citation
YURTSEVEN H. H., Kiraci A.
FERROELECTRICS, vol.437, pp.137-148, 2012 (SCI-Expanded)
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Publication Type:
Article / Article
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Volume:
437
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Publication Date:
2012
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Doi Number:
10.1080/00150193.2012.742343
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Journal Name:
FERROELECTRICS
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Journal Indexes:
Science Citation Index Expanded (SCI-EXPANDED), Scopus
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Page Numbers:
pp.137-148
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Keywords:
Damping constant, relaxation time, hexagonal barium titanate, TEMPERATURE-DEPENDENCE, PHASE-TRANSITIONS, RAMAN-SCATTERING, NEUTRON-SCATTERING, PHONONS, SPECTROSCOPY, FREQUENCY, BATIO3
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Middle East Technical University Affiliated:
Yes
Abstract
The temperature dependence of the damping constant is calculated below the transition temperature (T-0 = 222K) in the ferroelectric phase of hexagonal barium titanate. The damping constant of the coupled soft-optic and acoustic mode which causes an intense central peak in the light scattering spectra, is calculated using the soft mode-hard mode coupling model and the energy fluctuation model for barium titanate.