0598557 - FZÚ 2025 RIV US eng J - Journal Article
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 Ca_0.3Ba_0.7Nb₂O₆.
Physical Review B. Roč. 110, č. 10 (2024), č. článku 104302. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT(CZ) EH22_008/0004591
Grant - others:AV ČR(CZ) LAS-21-02
Program: Bilaterální spolupráce
Institutional support: RVO:68378271
Keywords : dielectric response * phonons * relaxations * ferroelectrics * phase transitions
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.2, year: 2023 ; AIS: 0.896, rok: 2023
Method of publishing: 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.
Permanent Link: https://hdl.handle.net/11104/0356371


 
Scientific data in ASEP :
Dataset for Coexisting polarization mechanisms in ferroelectric uniaxial tetragonal tungsten bronze Ca_0.3Ba_0.7Nb₂O₆ (CBN-30)