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

Rao, Badari Narayana ; Fitch, Andy N. ; Ranjan, Rajeev (2013) Ferroelectric-ferroelectric phase coexistence in Na1/2Bi1/2TiO3 Physical Review B: Condensed Matter and Materials Physics, 87 (6). ISSN 1098-0121

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Official URL: http://doi.org/10.1103/PhysRevB.87.060102

Related URL: http://dx.doi.org/10.1103/PhysRevB.87.060102

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:123011
Deposited On:02 Sep 2021 04:19
Last Modified:02 Sep 2021 04:19

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