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|title: ||Dual strain mechanisms in a lead-free morphotropic phase boundary ferroelectric|
|authors: ||Walker, Julian|
Alikin, Denis O.
Turygin, Anton P.
Shur, Vladimir Y.
Kholkin, Andrei L.
|issue date: ||2016|
|publisher: ||Nature Publishing Group|
|abstract: ||Electromechanical properties such as d33 and strain are significantly enhanced at morphotropic phase
boundaries (MPBs) between two or more different crystal structures. Many actuators, sensors and
MEMS devices are therefore systems with MPBs, usually between polar phases in lead (Pb)-based
ferroelectric ceramics. In the search for Pb-free alternatives, systems with MPBs between polar
and non-polar phases have recently been theorized as having great promise. While such an MPB
was identified in rare-earth (RE) modified bismuth ferrite (BFO) thin films, synthesis challenges
have prevented its realization in ceramics. Overcoming these, we demonstrate a comparable
electromechanical response to Pb-based materials at the polar-to-non-polar MPB in Sm modified
BFO. This arises from ‘dual’ strain mechanisms: ferroelectric/ferroelastic switching and a previously
unreported electric-field induced transition of an anti-polar intermediate phase. We show that
intermediate phases play an important role in the macroscopic strain response, and may have potential
to enhance electromechanical properties at polar-to-non-polar MPBs.|
|publisher version/DOI: ||http://doi.org/10.1038/srep19630|
|source: ||Scientific Reports|
|appears in collections||CICECO - Artigos|
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