Ferroelectric soft mode and microwave dielectric relaxation in BaTiO.sub.3./sub.-PbMg.sub.1/3./sub.Nb.sub.2/3./sub.O.sub.3./sub. ceramics

0543053 - FZÚ 2022 RIV US eng J - Journal Article
Bovtun, Viktor - Nuzhnyy, Dmitry - Kempa, Martin - Ostapchuk, Tetyana - Skoromets, Volodymyr - Suchanicz, J. - Czaja, P. - Petzelt, Jan - Kamba, Stanislav
Ferroelectric soft mode and microwave dielectric relaxation in BaTiO₃-PbMg_1/3Nb_2/3O₃ ceramics.
Physical Review Materials. Roč. 5, č. 1 (2021), č. článku 014404. ISSN 2475-9953. E-ISSN 2475-9953
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GF20-20326L
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; AV ČR(CZ) PAN-17-04
Program: Bilaterální spolupráce
Institutional support: RVO:68378271
Keywords : ferroelectrics * phase transitions * soft mode * microwave relaxation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.980, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevMaterials.5.014404

BT-100x%PMN, x=0.075, 0.10, 0.15 were studied by the infrared reflectivity, time-domain terahertz transmission and microwave spectroscopies.The spectra show presence of a split soft phonon at all temperatures, similar to that observed in BT and PMN. Microwave dielectric dispersion was observed both below and above temperature of the diffuse permittivity maximum. The relaxations show no PMN-like freezing. So the ceramics cannot be considered as relaxor ferroelectrics, but rather as ferroelectrics with the diffuse phase transition.
Permanent Link: http://hdl.handle.net/11104/0320359