Phonon anomalies in Pb.sub.1-x./sub.La.sub.x./sub.(Zr.sub.0.9./sub.Ti.sub.0.1./sub.)O.sub.3./sub. ceramics

0322299 - FZÚ 2009 RIV US eng J - Journal Article
Buixaderas, Elena - Gregora, Ivan - Kamba, Stanislav - Kužel, Petr - Reaney, I.
Phonon anomalies in Pb_1-xLa_x(Zr_0.9Ti_0.1)O₃ ceramics.
[Fononové anomálii v keramikách Pb_1-xLa_x(Zr_0.9Ti_0.1)O₃.]
Applied Physics Letters. Roč. 94, č. 5 (2009), 052903/1-052903/3. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA AV ČR IAA100100701; GA AV ČR KAN301370701; GA ČR(CZ) GA202/09/0682; GA ČR(CZ) GA202/06/0403
Institutional research plan: CEZ:AV0Z10100520
Keywords : phonons * Infrared and Raman spectra * ferroelectric phase transitions
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.554, year: 2009

The lattice dynamics of Pb1-xLax(Zr0.9Ti0.1)O3 (PLZT X/90/10) with X=0, 2, 4, 10% of La was studied by means of Far Infrared, Raman and terahertz spectroscopies in the temperature range of 20–800 K. Infrared active soft phonons with anomalies near the paraelectric-ferroelectric phase transition were found for all the samples. Some Raman active phonons show anomalies ~200 K below Tc, due to another phase transition to a ferroelectric state with doubled unit cell. Samples with higher La content (X=4,10) display nonclassical phonon softening described by ω2=a(T−Tc)γ with γ=2/3.

Dynamika mřížky v Pb1-xLax(Zr0.9Ti0.1)O3 (PLZT X/90/10, X=0, 2, 4, 10% La) byla studována pomocí daleké infračervené, Ramanovské a teraherzové spectroscopie v teplotním rozsahu 20-800 K. Infračerveně aktivní měkké módy s anomáliemi blízko přechodu z paraelektrické do ferroelectrické fáze byly nalezené.
Permanent Link: http://hdl.handle.net/11104/0170606