Počet záznamů: 1  

Coexisting polarization mechanisms in the ferroelectric uniaxial tetragonal tungsten bronze Ca.sub.0.3./sub.Ba.sub.0.7./sub.Nb.sub.2./sub.O.sub.6./sub.

  1. 1.
    0598557 - FZÚ 2025 RIV US eng J - Článek v odborném periodiku
    Buixaderas, Elena - Svirskas, Š. - Kadlec, Christelle - Savinov, Maxim - Lapienyte, P. - Kuttikkattil Ramachandran, Anirudh - Milesi-Brault, Cosme - Nuzhnyy, Dmitry - Dec, J.
    Coexisting polarization mechanisms in the ferroelectric uniaxial tetragonal tungsten bronze Ca0.3Ba0.7Nb2O6.
    Physical Review B. Roč. 110, č. 10 (2024), č. článku 104302. ISSN 2469-9950. E-ISSN 2469-9969
    Grant CEP: GA MŠMT(CZ) EH22_008/0004591
    Grant ostatní: AV ČR(CZ) LAS-21-02
    Program: Bilaterální spolupráce
    Institucionální podpora: RVO:68378271
    Klíčová slova: dielectric response * phonons * relaxations * ferroelectrics * phase transitions
    Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
    Impakt faktor: 3.2, rok: 2023 ; AIS: 0.896, rok: 2023
    Způsob publikování: Open access
    DOI: https://doi.org/10.1103/PhysRevB.110.104302

    Using a broad band dielectric spectroscopy approach (1 to 10^14 Hz) we prove that the tungsten bronze Ca0.3Ba0.7Nb2O6 (CBN-30) displays a ferroelectric phase transition of mixed displacive and order-disorder character, and its paraelectric phase does not show traces of relaxor behaviour but precursor effects as polar fluctuations below about 550 K. The analysis of the sub-MHz dielectric response together with infrared and Raman spectroscopy reveals that simultaneous polarization mechanisms are responsible for the phase transition. The comparison of the excitations found in CBN-30 with those of (Sr,Ba)Nb2O6 reveals that these mechanisms are congruous, although in CBN-30 the main relaxation process behaves differently due to the different domain structure.
    Trvalý link: https://hdl.handle.net/11104/0356371


     
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