Počet záznamů: 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

SYSNO ASEP	0340598
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg_1/3Nb_2/3O₃-35%PbTiO₃ ceramics: Grain size effects
Tvůrce(i)	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)
Zdroj.dok.	Physical Review. B - ISSN 1098-0121 Roč. 79, č. 10 (2009), 104111/1-104111/12
Poč.str.	12 s.
Jazyk dok.	eng - angličtina
Země vyd.	US - Spojené státy americké
Klíč. slova	polar clusters ; relaxor ferroelectrics ; soft modes ; phonons
Vědní obor RIV	BM - Fyzika pevných látek a magnetismus
CEP	OC 101 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
	GA202/09/0682 GA ČR - Grantová agentura ČR
	GA202/06/0403 GA ČR - Grantová agentura ČR
	OC09023 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000264768600038
DOI	10.1103/PhysRevB.79.104111
Anotace	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.
Pracoviště	Fyzikální ústav
Kontakt	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Rok sběru	2010

Počet záznamů: 1