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Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuthbased piezoceramics

Acosta, Matias and Schmitt, Ljubomira Ana and Cazorla, Claudio and Studer, Andrew J. and Zintler, Alexander and Glaum, Julia and Kleebe, Hans-Joachim and Donner, Wolfgang and Hoffmann, Mark and Rödel, Jürgen and Hinterstein, Manuel (2016):
Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuthbased piezoceramics.
6, In: Scientific reports, (28742), ISSN 2045-2322, [Article]

Abstract

Coupling of order parameters provides a means to tune functionality in advanced materials including multiferroics, superconductors, and ionic conductors. We demonstrate that the response of a frustrated ferroelectric state leads to coupling between order parameters under electric field depending on grain orientation. The strain of grains oriented along a specific crystallographic direction, 〈h00〉, is caused by converse piezoelectricity originating from a ferrodistortive tetragonal phase. For 〈hhh〉 oriented grains, the strain results from converse piezoelectricity and rotostriction, as indicated by an antiferrodistortive instability that promotes octahedral tilting in a rhombohedral phase. Both strain mechanisms combined lead to a colossal local strain of (2.4± 0.1) % and indicate coupling between oxygen octahedral tilting and polarization, here termed “rotopolarization”. These findings were confirmed with electromechanical experiments, in situ neutron diffraction, and in situ transmission electron microscopy in 0.75Bi 1/2Na1/2TiO3-0.25SrTiO3. This work demonstrates that polar and non-polar instabilities can cooperate to provide colossal functional responses.

Item Type: Article
Erschienen: 2016
Creators: Acosta, Matias and Schmitt, Ljubomira Ana and Cazorla, Claudio and Studer, Andrew J. and Zintler, Alexander and Glaum, Julia and Kleebe, Hans-Joachim and Donner, Wolfgang and Hoffmann, Mark and Rödel, Jürgen and Hinterstein, Manuel
Title: Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuthbased piezoceramics
Language: English
Abstract:

Coupling of order parameters provides a means to tune functionality in advanced materials including multiferroics, superconductors, and ionic conductors. We demonstrate that the response of a frustrated ferroelectric state leads to coupling between order parameters under electric field depending on grain orientation. The strain of grains oriented along a specific crystallographic direction, 〈h00〉, is caused by converse piezoelectricity originating from a ferrodistortive tetragonal phase. For 〈hhh〉 oriented grains, the strain results from converse piezoelectricity and rotostriction, as indicated by an antiferrodistortive instability that promotes octahedral tilting in a rhombohedral phase. Both strain mechanisms combined lead to a colossal local strain of (2.4± 0.1) % and indicate coupling between oxygen octahedral tilting and polarization, here termed “rotopolarization”. These findings were confirmed with electromechanical experiments, in situ neutron diffraction, and in situ transmission electron microscopy in 0.75Bi 1/2Na1/2TiO3-0.25SrTiO3. This work demonstrates that polar and non-polar instabilities can cooperate to provide colossal functional responses.

Journal or Publication Title: Scientific reports
Volume: 6
Number: 28742
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 02 Aug 2016 05:30
Identification Number: doi:10.1038/srep28742
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