Electric-field-induced phase transition in the relaxor ceramics based on PMN-PT

被引:12
|
作者
Talanov, M. V. [1 ]
Bunina, O. A. [1 ]
Bunin, M. A. [1 ]
Zakharchenko, I. N. [1 ]
Reznichenko, L. A. [1 ]
机构
[1] So Fed Univ, Inst Phys Res, Rostov Na Donu 344006, Russia
关键词
PEROVSKITE;
D O I
10.1134/S1063783413020339
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The mechanisms of formation of a plateau in dependences of the reversible permittivity on the external electric field strength in a ceramic sample of the yPZN-mPMN-nPNN - xPT (x = 0, 3; y = 0.0982; m = 0.4541; n = 0.1477) system have been analyzed using X-ray diffraction and atomic force microscopy. It has been shown that, in electric fields corresponding to the permittivity anomaly, there occurs an induced phase transition from the heterophase (tetragonal + pseudocubic) state to the single-phase (tetragonal) state. This leads to significant strains of the tetragonal unit cell (up to 0.1%) and the termination of 90A degrees domain switching. The proposed qualitative model of the formation of the observed dielectric anomaly is based on two processes occurring with an increase in the electric field strength: the growth of polar regions of the tetragonal phase and their switching.
引用
收藏
页码:326 / 333
页数:8
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