Lattice dynamics and domain wall oscillations of morphotropic Pb(Zr,Ti)O.sub.3./sub. ceramics

0463175 - FZÚ 2017 RIV US eng J - Journal Article
Buixaderas, Elena - Bovtun, Viktor - Kempa, Martin - Nuzhnyy, Dmitry - Savinov, Maxim - Vaněk, Přemysl - Gregora, Ivan - Malic, B.
Lattice dynamics and domain wall oscillations of morphotropic Pb(Zr,Ti)O₃ ceramics.
Physical Review. B. Roč. 94, č. 5 (2016), 1-10, č. článku 054315. ISSN 1098-0121
R&D Projects: GA ČR(CZ) GA14-25639S; GA MŠMT(CZ) LD15014
Institutional support: RVO:68378271
Keywords : PZT * phonon * lattice dynamics * dielectric response * Raman * infrared spectroscopy * broad-band spectroscopy * piezoelectrics
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.736, year: 2014

of morphotropic Pb(Zr1−xTix)O3 (PZT) ceramics with compositions PZT 52/48 and 53/47 were studied by a broadband spectroscopy approach, using Raman, far-infrared, time-domain terahertz (THz), and microwave spectroscopies. A careful evaluation of the evolution of phonon parameters with temperature clearly revealed only two macroscopic phase transitions of intrinsic origin, driven by phonons: the ferroelectric one at high temperatures near 650 K (driven by an anharmonic soft mode at THz frequencies coupled to a weak component at higher frequencies, ω ∼ 70 cm−1) and a transition to an antiferrodistortive phase around 400 K, signaled by a new peak (ω ∼ 60 cm−1) that appeared in the infrared and Raman spectra. This peak confirmed the onset of the antiphase tilt of the oxygen octahedra and the doubling of the unit cell, as well as the splitting of the B1-E doublet in the Raman spectra.
Permanent Link: http://hdl.handle.net/11104/0262428