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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.
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SYSNO ASEP 0598557 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Coexisting polarization mechanisms in the ferroelectric uniaxial tetragonal tungsten bronze Ca0.3Ba0.7Nb2O6 Author(s) Buixaderas, Elena (FZU-D) RID, ORCID
Svirskas, Š. (LT)
Kadlec, Christelle (FZU-D) RID, ORCID
Savinov, Maxim (FZU-D) RID, ORCID
Lapienyte, P. (LT)
Kuttikkattil Ramachandran, Anirudh (FZU-D) ORCID
Milesi-Brault, Cosme (FZU-D) ORCID
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Dec, J. (PL)Number of authors 9 Article number 104302 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 110, č. 10 (2024)Number of pages 11 s. Language eng - English Country US - United States Keywords dielectric response ; phonons ; relaxations ; ferroelectrics ; phase transitions Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EH22_008/0004591 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 001310225000015 EID SCOPUS 85203324427 DOI https://doi.org/10.1103/PhysRevB.110.104302 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0356371
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