Počet záznamů: 1

Soft antiferroelectric fluctuations in morphotropic PbZr.sub.1-x./sub.Ti.sub.x./sub.O.sub.3./sub. single crystals as evidenced by inelastic x-ray scattering

  1. 1.
    0361369 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Hlinka, Jiří - Ondrejkovič, Petr - Kempa, Martin - Borissenko, E. - Krisch, M. - Long, X. - Ye, Z. -G.
    Soft antiferroelectric fluctuations in morphotropic PbZr1-xTixO3 single crystals as evidenced by inelastic x-ray scattering.
    Physical Review. B. Roč. 83, č. 14 (2011), "140101-1"-"140101-4" ISSN 1098-0121
    Grant CEP: GA ČR GD202/09/H041; GA ČR GAP204/10/0616; GA MŠk ME08109; GA MŠk LA 287; GA MŠk(CZ) LA10010
    Grant ostatní: GA MŠk(CZ) SVV-2011-263307
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: inelastic X-ray scattering * lattice dynamics * PZT * piezoelectricity
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.691, rok: 2011

    Lattice dynamics of a PbZr1-xTixO3 single crystal with composition close to the morphotropic phase boundary has been investigated by inelastic x-ray scattering. Dispersion curves of the lowest frequency transverse optic and the transverse acoustic phonon modes propagating alog the [100] direction have been determined in the high-temperature paraelectric phase as well as in the room-temperature monoclinic phase. The measurement also reveals that upon cooling from the paraelectric to monoclinic phase, the spectral response of the M5, zone boundary phonon mode associated with antiferroelectric vibrations of lead ions is progressively transforming to a broad central mode. This indicates a crossover from vibrational to relaxational-type dynamics. The existence of this phenomenon previously observed in relaxor materials is a striking result for PZT and it is believed to arise from the nanoscale structural inhomogeneity of these materials.
    Trvalý link: http://hdl.handle.net/11104/0198693