Dielectric anisotropy in relaxor ferroelectric Pb0.775La0.15(Zr0.4Ti0.6)O3 ceramics

被引：13
|
作者：
Buixaderas, E.
Kamba, S.
Petzelt, J.
Drahokoupil, J.
Laufek, F.
Kosec, M.
机构：
[1] Inst Phys, CZ-18221 Prague, Czech Republic
[2] Czech Geol Survey, CZ-15200 Prague, Czech Republic
[3] Jozef Stefan Inst, SL-1000 Ljubljana, Slovenia
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 11期
关键词：
D O I：
10.1063/1.2783962
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A huge dielectric anisotropy has been found in Pb0.775La0.15(Zr0.4Ti0.6)O-3 (PLZT 15/40/60) ceramics by analysis of infrared reflectivity spectra. Anisotropy is present in both the relaxor and the ferroelectric phases. Infrared spectra were evaluated using Bruggeman's formula within the effective medium approximation. X-ray structural analysis supports a local [110] shift of Pb cations and factor-group analysis taking into account the 4d site symmetry for the effective Pb/La atom gives more infrared and Raman active phonons than the previous published factor-group analysis, in agreement with our infrared data. Symmetry of all observed polar phonons was assigned.
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