TITLE

Phonon anomalies in Pb1-xLax(Zr0.9Ti0.1)O3 ceramics

AUTHOR(S)
Buixaderas, E.; Gregora, I.; Kamba, S.; Kuzˇel, P.; Reaney, I.
PUB. DATE
February 2009
SOURCE
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
36534199

 

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