About: Polar modes in K0.5Na0.5NbO3 ceramics

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Phonons in K0.5Na0.5NbO3 (KNN-50) ceramics were investigated from 10 to 900 K by means of Raman, infrared and THz spectroscopy. A first-order phase transition was detected from cubic to tetragonal phases at about 710 K, when the first component of the polarization appears. Transition from the tetragonal to the orthorhombic phase takes place around 475 K. The last transition from orthorhombic to rhombohedral phases is strongly first order. Tc is about 90 K and all Raman active modes below 100 cm-1 disappear. An overdamped soft mode is present at high temperatures in the THz range but another excitation below phonons is needed to explain the static value of the permittivity. Phonons in K0.5Na0.5NbO3 (KNN-50) ceramics were investigated from 10 to 900 K by means of Raman, infrared and THz spectroscopy. A first-order phase transition was detected from cubic to tetragonal phases at about 710 K, when the first component of the polarization appears. Transition from the tetragonal to the orthorhombic phase takes place around 475 K. The last transition from orthorhombic to rhombohedral phases is strongly first order. Tc is about 90 K and all Raman active modes below 100 cm-1 disappear. An overdamped soft mode is present at high temperatures in the THz range but another excitation below phonons is needed to explain the static value of the permittivity. (en)
Title	Polar modes in K0.5Na0.5NbO3 ceramics Polar modes in K0.5Na0.5NbO3 ceramics (en)
skos:prefLabel	Polar modes in K0.5Na0.5NbO3 ceramics Polar modes in K0.5Na0.5NbO3 ceramics (en)
skos:notation	RIV/68378271:_____/09:00331750!RIV10-AV0-68378271
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/06/0411), P(IAA100100701), P(KAN301370701), Z(AV0Z10100520)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Gregora, Ivan Nuzhnyy, Dmitry Kamba, Stanislav Buixaderas, Elena
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	334027
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/09:00331750
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ferroelectrics; lattice dynamics; phonons; Ir and Raman spectroscopy; piezoelectrics; THz spectroscopy (en)
http://linked.open.../riv/klicoveSlovo	lattice dynamics phonons Ir and Raman spectroscopy THz spectroscopy ferroelectrics piezoelectrics
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[B9605E6C8E30]
http://linked.open...i/riv/nazevZdroje	Ferroelectrics
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Nanostructured Macroscopic Systems - Technology and Characterisation Domain phenomena in ferroic crystals Lattice dynamics and dielectric behaviour of high permittivity ferroelectric and relaxor-ferroelectric perovskites
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	391
http://linked.open...iv/tvurceVysledku	Kosec, M. Kamba, Stanislav Nuzhnyy, Dmitry Gregora, Ivan Buixaderas, Elena Malič, B.
http://linked.open...ain/vavai/riv/wos	000272607100008
http://linked.open...n/vavai/riv/zamer	Specific effects in condensed systems with reduced dimension and broken symmetry
issn	0015-0193
number of pages	7 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Polar modes in K0.5Na0.5NbO3 ceramics Polar modes in K0.5Na0.5NbO3 ceramics Polar modes in K0.5Na0.5NbO3 ceramics Polar modes in K0.5Na0.5NbO3 ceramics

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