Multiple polarization mechanisms across the ferroelectric phase transition of the tetragonal tungsten-bronze Sr.sub.0.35./sub.Ba.sub.0.69./sub.Nb.sub.2./sub.O.sub.6.04./sub

Buixaderas, Elena; Kempa, Martin; Bovtun, Viktor; Kadlec, Christelle; Savinov, Maxim; Borodavka, Fedir; Vaněk, Přemysl; Steciuk, Gwladys; Palatinus, Lukáš; Dec, J.

doi:https://dx.doi.org/10.1103/PhysRevMaterials.2.124402

Number of the records: 1

Multiple polarization mechanisms across the ferroelectric phase transition of the tetragonal tungsten-bronze Sr.sub.0.35./sub.Ba.sub.0.69./sub.Nb.sub.2./sub.O.sub.6.04./sub

1.

SYSNO ASEP	0499771
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Multiple polarization mechanisms across the ferroelectric phase transition of the tetragonal tungsten-bronze Sr_0.35Ba_0.69Nb₂O_6.04./sub
Author(s)	Buixaderas, Elena (FZU-D)_{RID, ORCID} Kempa, Martin (FZU-D)_{RID, ORCID} Bovtun, Viktor (FZU-D)_{RID, ORCID, SAI} Kadlec, Christelle (FZU-D)_{RID, ORCID} Savinov, Maxim (FZU-D)_{RID, ORCID} Borodavka, Fedir (FZU-D)_{RID, ORCID} Vaněk, Přemysl (FZU-D)_{RID, ORCID} Steciuk, Gwladys (FZU-D)_ORCID Palatinus, Lukáš (FZU-D)_{RID, ORCID} Dec, J. (PL)
Number of authors	10
Article number	124402
Source Title	Physical Review Materials. - : American Physical Society - ISSN 2475-9953 Roč. 2, č. 12 (2018), s. 1-12
Number of pages	12 s.
Language	eng - English
Country	US - United States
Keywords	broad-band dielectric spectroscopy ; phonons ; tetragonal tungsten-bronzes ; ferroelectricity
Subject RIV	BM - Solid Matter Physics ; Magnetism
OECD category	Condensed matter physics (including formerly solid state physics, supercond.)
R&D Projects	GA16-09142S GA ČR - Czech Science Foundation (CSF)
Institutional support	FZU-D - RVO:68378271
UT WOS	000454435900003
EID SCOPUS	85060591505
DOI	10.1103/PhysRevMaterials.2.124402
Annotation	The broadband dielectric response of the uniaxial ferroelectric strontium barium niobate with 35% Sr has been studied from 1 kHz to 30 THz along the polar c axis using high-frequency and low-frequency dielectric spectroscopies, time-domain terahertz spectroscopy, and far-infrared reflectivity, in the wide temperature interval 20–600 K. The mechanisms that contribute to the ferroelectric phase transition and to the dielectric anomaly in this material are the softening of an anharmonic excitation in the THz range related to cation hopping and the slowing down of a relaxation in the GHz range, which saturates below TC near 1 MHz. In the ferroelectric phase, a relaxation, related to domain-wall dynamics, appears in the sub-GHz range and hardens on cooling up to 10 GHz. The ferroelectric-paraelectric transition, investigated by electron diffraction, has been assessed to the appearance of a supplementary mirror plane perpendicular to the polar axis.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2019

Number of the records: 1