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Statements

Subject Item
n2:RIV%2F68378271%3A_____%2F09%3A00331199%21RIV10-AV0-68378271
rdf:type
n15:Vysledek skos:Concept
dcterms: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.
dcterms: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
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
skos:notation
RIV/68378271:_____/09:00331199!RIV10-AV0-68378271
n3:aktivita
n4:P n4:Z
n3:aktivity
P(GA202/06/0403), P(IAA100100701), P(KAN301370701), Z(AV0Z10100520)
n3:cisloPeriodika
9
n3:dodaniDat
n6:2010
n3:domaciTvurceVysledku
n9:3444945 n9:8720789 n9:7348320 n9:3635031 Buixaderas, Elena
n3:druhVysledku
n7:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
323331
n3:idVysledku
RIV/68378271:_____/09:00331199
n3:jazykVysledku
n17:eng
n3:klicovaSlova
ferroelectrics; lattice dynamics; phonons Ir and Raman spectroscopy; piezoelectrics; THz spectroscopy
n3:klicoveSlovo
n10:lattice%20dynamics n10:phonons%20Ir%20and%20Raman%20spectroscopy n10:piezoelectrics n10:ferroelectrics n10:THz%20spectroscopy
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[EC6D5CB575FE]
n3:nazevZdroje
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
n3:obor
n12:BM
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
7
n3:projekt
n5:GA202%2F06%2F0403 n5:IAA100100701 n5:KAN301370701
n3:rokUplatneniVysledku
n6:2009
n3:svazekPeriodika
56
n3:tvurceVysledku
Nuzhnyy, Dmitry Buixaderas, Elena Berta, Milan Gregora, Ivan Malič, B. Kosec, M. Kamba, Stanislav
n3:wos
00026929830001
n3:zamer
n18:AV0Z10100520
s:issn
0885-3010
s:numberOfPages
7