Lattice dynamics and dielectric spectroscopy of BZT and NBT lead-free perovskite relaxors - comparison with lead-based relaxors

被引：21
|
作者：
Petzelt, Jan [1 ]
Nuzhnyy, Dmitry [1 ]
Bovtun, Viktor [1 ]
Kempa, Martin [1 ]
Savinov, Maxim [1 ]
Kamba, Stanislav [1 ]
Hlinka, Jiri [1 ]
机构：
[1] Inst Phys AS CR, Prague, Czech Republic
来源：
PHASE TRANSITIONS | 2015年 / 88卷 / 03期
关键词：
relaxor ferroelectrics; dielectric spectroscopy; polar nanoregions; polar phonons; off-centred ions; PHASE-TRANSITIONS; FERROELECTRICS; BAZRXTI1-XO3; PERSPECTIVE; CERAMICS; RAMAN; SOFT;
D O I：
10.1080/01411594.2014.961156
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Appearance of the polar nanoregions (PNR) and their manifestation in the dielectric spectra is discussed for lead-free Ba(ZrxTi1-x)O-3 (BZT-x) and (Na1/2Bi1/2)TiO3 (NBT) ceramics. Phonon softening is not as pronounced as in the lead-based relaxors, but the relaxation contribution is dominating in all cases, caused by the dynamics of the off-centred ions (Ti4+, Bi3+, Pb2+). In the lead-based relaxors, where there is no relation between the quenched chemical clusters at the B-sites and PNR, which concern the A-site Pb-ion correlations, the relaxation dynamics follows the Vogel-Fulcher behaviour with a clear freezing. However, in BZT and NBT, the PNR are smaller, since they are localised within the small quenched chemical clusters of BaTiO3 and BiTiO3, respectively. Their dynamics is Arrhenius-like, which indicates hopping of the off-centred Ti4+ and Bi3+ ions, respectively, without their complete freezing. BZT can be classified as a dipolar glass and NBT as a nanoscopic ferroelectric with peculiar Bi-ion dynamics.
引用
收藏
页码：320 / 332
页数：13
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