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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Polar lattice vibrations and phase transition dynamics in Pb(Zr1-xTix)O3. Tvůrce(i) 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)Zdroj.dok. Physical Review. B - ISSN 1098-0121
Roč. 84, č. 18 (2011), 184302/1-184302/12Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova phonons ; lattice dynamics ; PZT ; IR spectroscopy Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GAP204/10/0616 GA ČR - Grantová agentura ČR CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000297100900005 DOI 10.1103/PhysRevB.84.184302 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
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