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 Dual strain mechanisms in a lead-free morphotropic phase boundary ferroelectric
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/18332

title: Dual strain mechanisms in a lead-free morphotropic phase boundary ferroelectric
authors: Walker, Julian
Simons, Hugh
Alikin, Denis O.
Turygin, Anton P.
Shur, Vladimir Y.
Kholkin, Andrei L.
Ursic, Hana
Bencan, Andreja
Malic, Barbara
Nagarajan, Valanoor
Rojac, Tadej
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.
URI: http://hdl.handle.net/10773/18332
ISSN: 2045-2322
publisher version/DOI: http://doi.org/10.1038/srep19630
source: Scientific Reports
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