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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

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    0361369 - FZÚ 2012 RIV US eng J - Journal Article
    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
    R&D Projects: GA ČR GD202/09/H041; GA ČR GAP204/10/0616; GA MŠMT ME08109; GA MŠMT LA 287; GA MŠMT(CZ) LA10010
    Grant - others:GA MŠk(CZ) SVV-2011-263307
    Institutional research plan: CEZ:AV0Z10100520
    Keywords : inelastic X-ray scattering * lattice dynamics * PZT * piezoelectricity
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 3.691, year: 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.
    Permanent Link: http://hdl.handle.net/11104/0198693

     
     
Number of the records: 1  

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