Infrared and THz Soft-Mode Spectroscopy of (Ba,Sr)TiO3 Ceramics
authors Ostapchuk, T; Petzelt, J; Kuzel, P; Veljko, S; Tkach, A; Vilarinho, P; Ponomareva, I; Bellaiche, L; Smirnova, E; Lemanov, V; Sotnikov, A; Weihnacht, M
nationality International
journal FERROELECTRICS
author keywords Soft mode; permittivity; IR reflectivity; BaxSr1-xTiO3 ceramics
keywords DIELECTRIC RESPONSE; PHASE-TRANSITION; FERROELECTRICS; BAXSR1-XTIO3; CRYSTALS
abstract We performed a study of the temperature dependence of the dielectric response of (Ba,Sr)TiO3 (BST) ceramics for the whole composition range in a wide frequency range by means of Fourier transform infrared, time-domain THz, microwave and low-frequency dielectric spectroscopy. Room-temperature spectra of the paraelectric dielectric response were compared with the results of first-principle simulations within the effective Hamiltonian approach with a good semi-quantitative agreement. It is shown that in the paraelectric phase away from the transition temperature, the complex THz soft mode, consisting of two overlapping heavily damped oscillators, fully accounts for the low-frequency dielectric properties. However, close to TC additional central-mode type dispersion, apparently caused by the pre-transitional polar clusters, is to be expected in the microwave dielectric spectra.
publisher TAYLOR & FRANCIS LTD
issn 0015-0193
year published 2008
volume 367
beginning page 139
ending page 148
digital object identifier (doi) 10.1080/00150190802375185
web of science category Materials Science, Multidisciplinary; Physics, Condensed Matter
subject category Materials Science; Physics
unique article identifier WOS:000260772200019
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journal impact factor 0.669
5 year journal impact factor 0.718
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