About: Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Tento článek nabízí porovnávací výzkum dvou nanokrystalických (50 a 100 nm velká zrna) a dvou velkozrnných (1,2 a 10 µm velká zrna) keramik pomocí fourierovské infračervené spektroskopie v širokém teplotním intervalu (10-570 K). Ukázalo se, že v paraelektrickém stavu příčinou menší dielektrické permitivity je ztuhnutí a oslabení přetlumeného měkkého modu v nanozrnných keramikách, kdežto ve feroelektrickém stavu silná závislost dielektrické konstanty na rozměru zrn nesouvisí s dynamikou mřížky (cs) The article offers comparative study of two nanocrystalline (50 and 100 nm averaged grain size) and two coarse-grain (1.2 and 10 µm averaged grain size) ceramics by means of Fourier transform infrared spectroscopy in a broad temperature range (10-570 K). It appears that the stiffening and weakening of the overdamped soft mode is the only reason for the reduced dielectric permittivity of nanocrystalline ceramics in the paraelectric phase, but a strong grain-size dependence of the dielectric constant in the ferroelectric phase is not connected with with the changes in lattice dynamics The article offers comparative study of two nanocrystalline (50 and 100 nm averaged grain size) and two coarse-grain (1.2 and 10 µm averaged grain size) ceramics by means of Fourier transform infrared spectroscopy in a broad temperature range (10-570 K). It appears that the stiffening and weakening of the overdamped soft mode is the only reason for the reduced dielectric permittivity of nanocrystalline ceramics in the paraelectric phase, but a strong grain-size dependence of the dielectric constant in the ferroelectric phase is not connected with with the changes in lattice dynamics (en)
Title	Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy (en) Efekt rozměru zrn v keramikách BaTiO3 : studium dalekou infračervenou spektroskopií (cs)
skos:prefLabel	Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy Grain-size effect in BaTiO3 ceramics: study by far infrared spectroscopy (en) Efekt rozměru zrn v keramikách BaTiO3 : studium dalekou infračervenou spektroskopií (cs)
skos:notation	RIV/68378271:_____/06:00079393!RIV07-AV0-68378271
http://linked.open.../vavai/riv/strany	361;373
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/04/0993), P(GP202/06/P219), Z(AV0Z10100520)
http://linked.open...iv/cisloPeriodika	6-7
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Petzelt, Jan Savinov, Maxim Ostapchuk, Tetyana
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	477270
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/06:00079393
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	barium titanat; nanocrystalline ceramics; infrared reflectivity; permittivity; grain-size effect; soft-mode (en)
http://linked.open.../riv/klicoveSlovo	permittivity nanocrystalline ceramics barium titanat grain-size effect infrared reflectivity soft-mode
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[755CA4DF93C6]
http://linked.open...i/riv/nazevZdroje	Phase Transitions
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Dielectric response of nano-inhomogenous high-permittivity systems Study of size effects in nano-grained (Ba,Sr)TiO3 ceramics.
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	79
http://linked.open...iv/tvurceVysledku	Petzelt, Jan Savinov, Maxim Buscaglia, V. Ostapchuk, Tetyana Mitoserius, L.
http://linked.open...n/vavai/riv/zamer	Specific effects in condensed systems with reduced dimension and broken symmetry
issn	0141-1594
number of pages	13 (xsd:int)

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