Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg1/3Nb2/3O3-35%PbTiO3 ceramics: Grain size effects

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg1/3Nb2/3O3-35%PbTiO3 ceramics: Grain size effects

Popis výsledku v původním jazyce

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 ?m) 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 relaxorbehavior with substantially smaller permittivity showing partial clamping of the polar nanocluster dynamics by grain boundaries.

Název v anglickém jazyce

Broadband dielectric spectroscopy of phonons and polar nanoclusters in PbMg1/3Nb2/3O3-35%PbTiO3 ceramics: Grain size effects

Popis výsledku anglicky

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 ?m) 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 relaxorbehavior with substantially smaller permittivity showing partial clamping of the polar nanocluster dynamics by grain boundaries.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review. B

ISSN

1098-0121

e-ISSN

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Svazek periodika

79

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

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Kód UT WoS článku

000264768600038

EID výsledku v databázi Scopus

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