Composition driven structural instability in perovskite ferroelectrics

Ferroelectric solid solutions usually exhibit enhanced functional properties at the morphotropic phase boundary separating two ferroelectric phases with different orientations of polarization. The underlying mechanism is generally associated with polarization rotational instability and the flattened...

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Bibliographic Details
Published in:AIP advances 2017-04, Vol.7 (4), p.045112-045112-6
Main Authors: Xu, Chao, Li, Qiang, Yan, Qingfeng, Zhang, Yiling, Chu, Xiangcheng
Format: Article
Language:English
Subjects:
Ferroelectric materials
Ferroelectricity
Free energy
Perovskites
Phase boundaries
Piezoelectricity
Polarization
Solid solutions
Structural stability
Temperature effects
Thermal stability
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Summary:Ferroelectric solid solutions usually exhibit enhanced functional properties at the morphotropic phase boundary separating two ferroelectric phases with different orientations of polarization. The underlying mechanism is generally associated with polarization rotational instability and the flattened free energy profile. In this work we show that the polarization extensional instability can also be induced at the morphotropic phase boundary beyond the reported polar-nonpolar phase boundary. The piezoelectricity enhanced by this mechanism exhibits excellent thermal stability, which helps to develop high performance piezoelectric materials with good temperature stability.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4979506