Ferroelectricity in antiferroelectric NaNbO3 crystal

被引：32
|
作者：
Tyunina, M. [1 ,2 ]
Dejneka, A. [2 ]
Rytz, D. [3 ]
Gregora, I. [2 ]
Borodavka, F. [2 ]
Vondracek, M. [2 ]
Honolka, J. [2 ]
机构：
[1] Univ Oulu, Microelect & Mat Phys Labs, FI-90014 Oulu, Finland
[2] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic
[3] Forschungsinst Mineral & Metall Werkstoffe Edelst, D-55743 Idar Oberstein, Germany
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2014年 / 26卷 / 12期
关键词：
sodium niobate; ferroelectric; optical; HIGH-TEMPERATURE PHASES; SODIUM NIOBATE; X-RAY; POLYMORPHISM; DIFFRACTION; TRANSITIONS;
D O I：
10.1088/0953-8984/26/12/125901
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Sodium niobate (NaNbO3, or NNO) is known to be antiferroelectric at temperatures between 45 and 753 K. Here we show experimentally the presence of the ferroelectric phase at temperatures between 100 and 830 K in the NNO crystals obtained by top-seeded solution growth. The ferroelectric phase and new phase transitions are evidenced using a combination of thermo-optical studies by variable angle spectroscopic ellipsometry, Raman spectroscopy analysis, and photoelectron emission microscopy. The possibility for strain-induced ferroelectricity in NNO is suggested.
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页数：8
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