Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg.sub.1/3./sub.Nb.sub.2/3./sub.O.sub.3./sub.-35%PbTiO.sub.3./sub. ceramics: Grain size effects

Bovtun, Viktor; Kamba, Stanislav; Veljko, Sergiy; Nuzhnyy, Dmitry; Kroupa, Jan; Savinov, Maxim; Vaněk, Přemysl; Petzelt, Jan; Holc, J.; Kosec, M.; Amorin, H.; Alguero, M.

doi:https://dx.doi.org/10.1103/PhysRevB.79.104111

Number of the records: 1

Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg.sub.1/3./sub.Nb.sub.2/3./sub.O.sub.3./sub.-35%PbTiO.sub.3./sub. ceramics: Grain size effects

1.

SYSNO ASEP	0340598
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg_1/3Nb_2/3O₃-35%PbTiO₃ ceramics: Grain size effects
Author(s)	Bovtun, Viktor (FZU-D)_{RID, ORCID, SAI} Kamba, Stanislav (FZU-D)_{RID, ORCID, SAI} Veljko, Sergiy (FZU-D) Nuzhnyy, Dmitry (FZU-D)_{RID, ORCID} Kroupa, Jan (FZU-D)_{RID, ORCID} Savinov, Maxim (FZU-D)_{RID, ORCID} Vaněk, Přemysl (FZU-D)_{RID, ORCID} Petzelt, Jan (FZU-D)_{RID, ORCID, SAI} Holc, J. (SI) Kosec, M. (SI) Amorin, H. (ES) Alguero, M. (ES)
Source Title	Physical Review. B - ISSN 1098-0121 Roč. 79, č. 10 (2009), 104111/1-104111/12
Number of pages	12 s.
Language	eng - English
Country	US - United States
Keywords	polar clusters ; relaxor ferroelectrics ; soft modes ; phonons
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	OC 101 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	GA202/09/0682 GA ČR - Czech Science Foundation (CSF)
	GA202/06/0403 GA ČR - Czech Science Foundation (CSF)
	OC09023 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000264768600038
DOI	10.1103/PhysRevB.79.104111
Annotation	The dielectric response of PMN-35%PT ceramics from 100 Hz up to 100 THz was determined in a broad temperature range 5-900 K. Two ceramics were studied and compared: coarse grain ceramics (CGC - grain size ~ 4 µm) and fine grain ceramics (FGC – grain size ~ 150 nm). Both ceramics showed similar polar phonon response and the ferroelectric transition near TC = 440 K was manifested by partial softening of the overdamped lowest-frequency phonon. However, the dielectric response was dominated by a complex relaxational dispersion in the microwave range due to relaxor-like dynamics of the polar nanoclusters, which strongly differed in both the ceramics. Whereas the CGC undergoes a well-defined ferroelectric transition like a single crystal, FGC exhibits a relaxor behavior with substantially smaller permittivity showing partial clamping of the polar nanocluster dynamics by grain boundaries.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2010

Number of the records: 1