About: Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Phonons in both ceramic samples KNbO3 (KN) and K0.5Na0.5NbO3 (KNN-50) were investigated from 10 to 900 K by means of Raman, infrared, and THz spectroscopy. First-order transitions from cubic to tetragonal phases were detected at about 755 K (in KN) and 710 K (in KNN-50), where the first component of the polarization appears. Transitions from the tetragonal to the orthorhombic phases take place around 510 and 475 K, respectively. The last transitions from orthorhombic to rhombohedral phases are strongly first-order type. TC is shifted from 200 K in KN to about 90 K in KNN-50. All Raman active modes below 200 cm-1 disappear in KN but not in KNN-50. The overdamped soft mode present at high temperatures in the THz range changes its dielectric strength at each phase transition. Phonons in both ceramic samples KNbO3 (KN) and K0.5Na0.5NbO3 (KNN-50) were investigated from 10 to 900 K by means of Raman, infrared, and THz spectroscopy. First-order transitions from cubic to tetragonal phases were detected at about 755 K (in KN) and 710 K (in KNN-50), where the first component of the polarization appears. Transitions from the tetragonal to the orthorhombic phases take place around 510 and 475 K, respectively. The last transitions from orthorhombic to rhombohedral phases are strongly first-order type. TC is shifted from 200 K in KN to about 90 K in KNN-50. All Raman active modes below 200 cm-1 disappear in KN but not in KNN-50. The overdamped soft mode present at high temperatures in the THz range changes its dielectric strength at each phase transition. (en)
Title	Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics (en)
skos:prefLabel	Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics (en)
skos:notation	RIV/68378271:_____/09:00331199!RIV10-AV0-68378271
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/06/0403), P(IAA100100701), P(KAN301370701), Z(AV0Z10100520)
http://linked.open...iv/cisloPeriodika	9
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Gregora, Ivan Nuzhnyy, Dmitry Kamba, Stanislav Berta, Milan 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	323331
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/09:00331199
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	phonons Ir and Raman spectroscopy lattice dynamics THz spectroscopy ferroelectrics piezoelectrics
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[EC6D5CB575FE]
http://linked.open...i/riv/nazevZdroje	IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Nanostructured Macroscopic Systems - Technology and Characterisation Broad-band dielektric spectroscopy of relaxor ferroelectrics and multiferroics Lattice dynamics and dielectric behaviour of high permittivity ferroelectric and relaxor-ferroelectric perovskites
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	56
http://linked.open...iv/tvurceVysledku	Kosec, M. Kamba, Stanislav Nuzhnyy, Dmitry Gregora, Ivan Buixaderas, Elena Malič, B. Berta, Milan
http://linked.open...ain/vavai/riv/wos	00026929830001
http://linked.open...n/vavai/riv/zamer	Specific effects in condensed systems with reduced dimension and broken symmetry
issn	0885-3010
number of pages	7 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics Lattice dynamics and phase transitions in KNbO3 and K0.5Na0.5NbO3 ceramics

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