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

被引：16
|
作者：
Buixaderas, E. [1 ]
Gregora, I. [1 ]
Kamba, S. [1 ]
Kuzel, P. [1 ]
Reaney, I. [2 ]
机构：
[1] ASCR, Inst Phys, Prague 18221 8, Czech Republic
[2] Univ Sheffield, Sheffield S1 3JD, S Yorkshire, England
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
ferroelectric ceramics; ferroelectric transitions; infrared spectra; lanthanum; lead compounds; phonons; Raman spectra; soft modes; submillimetre wave spectra; LEAD-ZIRCONATE-TITANATE; PHASES; RANGE;
D O I：
10.1063/1.3077019
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The lattice dynamics of Pb1-xLax(Zr0.9Ti0.1)O-3 (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 similar to 200 K below T-C, 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 omega(2)=a(T-T-C)(gamma) with gamma=2/3.
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页数：3
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