Ferroelectric-ferroelectric phase coexistence in Na1/2Bi1/2TiO3

被引：131
|
作者：
Rao, Badari Narayana [1 ]
Fitch, Andy N. [2 ]
Ranjan, Rajeev [1 ]
机构：
[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 06期
关键词：
POLARIZATION ROTATION; NA0.5BI0.5TIO3; TRANSITIONS; PIEZOELECTRICS; CERAMICS; TEM;
D O I：
10.1103/PhysRevB.87.060102
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Morphotropic phase boundary (MPB) systems are characterized by the coexistence of two ferroelectric phases and are associated with anomalous piezoelectric properties. In general, such coexistence is brought about by composition induced ferroelectric-ferroelectric instability. Here we demonstrate that a pure ferroelectric compound Na1/2Bi1/2TiO3 (NBT) exhibits the coexistence of two ferroelectric phases, rhombohedral (R3c) and monoclinic (Cc), in its equilibrium state at room temperature. This was unravelled by adopting a unique strategy of comparative structural analysis of electrically poled and thermally annealed specimens using high resolution synchrotron x-ray powder diffraction data. The relative fraction of the coexisting phases was found to be highly sensitive to thermal, mechanical, and electrical stimuli. The coexistence of ferroelectric phases in the ground state of the pure compound will have significant bearing on the way MPB is induced in NBT-based lead-free piezoceramics. DOI: 10.1103/PhysRevB.87.060102
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页数：5
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