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Polar lattice vibrations and phase transition dynamics in Pb(Zr.sub.1-x./sub.Ti.sub.x./sub.)O.sub.3./sub..
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SYSNO ASEP 0368188 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Polar lattice vibrations and phase transition dynamics in Pb(Zr1-xTix)O3. Author(s) Buixaderas, Elena (FZU-D) RID, ORCID
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Jin, L. (CH)
Damjanović, D. (CH)Source Title Physical Review. B - ISSN 1098-0121
Roč. 84, č. 18 (2011), 184302/1-184302/12Number of pages 12 s. Language eng - English Country US - United States Keywords phonons ; lattice dynamics ; PZT ; IR spectroscopy Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP204/10/0616 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000297100900005 DOI 10.1103/PhysRevB.84.184302 Annotation Infrared (IR) reflectivity spectra of nominally pure Pb(Zr1-xTix)O3 ceramics with different Ti/Zr concentration (x = 0.42 – 0.58) were measured and evaluated along with the time-domain THz transmittance spectra in the temperature range 10 – 900 K. The temperature dependence of the low-frequency vibrations, related to Pb atoms, was analyzed in terms of two overdamped modes –a soft mode and an anharmonic hopping central mode– in the cubic and high-temperature ferroelectric phase, and three main vibrations in the low-temperature ferroelectric phase with the doubled unit cell: two E-symmetry modes (the soft mode and a mode corresponding to anti-phase vibrations of neighbouring Pb atoms in the THz range), and the antiferrodistortive mode producing the anti-phase tilts of the oxygen octahedra. The last bare mode is not IR active, but it becomes activated by coupling with the soft mode. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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