Ultra-broad-band dielectric spectroscopy and phonons in (Pb.sub.1-x/2./sub.La.sub.x./sub.)(Zr.sub.0.9./sub.Ti.sub.0.1./sub.)O.sub.3./sub..

0352316 - FZÚ 2011 RIV US eng J - Journal Article
Buixaderas, Elena - Bovtun, Viktor - Veljko, Sergiy - Savinov, Maxim - Kužel, Petr - Gregora, Ivan - Kamba, Stanislav - Reaney, I.
Ultra-broad-band dielectric spectroscopy and phonons in (Pb_1-x/2La_x)(Zr_0.9Ti_0.1)O₃.
Journal of Applied Physics. Roč. 108, č. 10 (2010), 104101/1-104101/10. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA AV ČR KAN301370701; GA ČR GAP204/10/0616
Institutional research plan: CEZ:AV0Z10100520
Keywords : PLZT * phase transitions * Raman and IR spectroscopy * ferro-antiferroelectricity
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.064, year: 2010

The dielectric behavior of (Pb1−x/2Lax)(Zr0.9Ti0.1)O3 PLZT 100x/90/10 (0 ≤ 100x ≤ 1) was studied in the frequency range 102–1014 Hz using dielectric, time-domain terahertz (THz), far-infrared, and Raman spectroscopy in the temperature interval 10–900 K. PZT 90/10 and PLZT 2/90/10 undergo two phase transitions, from a cubic paraelectric to a rhombohedral untilted ferroelectric (FE) phase and on further cooling to a tilted FE phase. PLZT 4/90/10 and PLZT 10/90/10 are incommensurately modulated and composed of an intergrowth of polar and antipolar cation displacements. These samples consequently demonstrate a FE soft mode which exhibits minimal frequency several tens of degrees above the nominal antiferroelectric phase transition temperature. The dielectric response of PLZT 100x/90/10 is mainly governed by a gigahertz relaxation and a soft phonon component in the THz range.
Permanent Link: http://hdl.handle.net/11104/0191849