Počet záznamů: 1

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..

  1. 1.
    0352316 - FZU-D 2011 RIV US eng J - Článek v odborném periodiku
    Buixaderas, Elena - Bovtun, Viktor - Veljko, Sergiy - Savinov, Maxim - Kužel, Petr - Gregora, Ivan - Kamba, Stanislav - Reaney, I.
    Ultra-broad-band dielectric spectroscopy and phonons in (Pb1-x/2Lax)(Zr0.9Ti0.1)O3.
    Journal of Applied Physics. Roč. 108, č. 10 (2010), 104101/1-104101/10 ISSN 0021-8979
    Grant CEP: GA AV ČR KAN301370701; GA ČR GAP204/10/0616
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: PLZT * phase transitions * Raman and IR spectroscopy * ferro-antiferroelectricity
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.064, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0191849