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

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

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2016
Autor(en): Acosta, Matias ; Schmitt, Ljubomira Ana ; Cazorla, Claudio ; Studer, Andrew J. ; Zintler, Alexander ; Glaum, Julia ; Kleebe, Hans-Joachim ; Donner, Wolfgang ; Hoffmann, Mark ; Rödel, Jürgen ; Hinterstein, Manuel
Titel: Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuthbased piezoceramics
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Scientific reports
Band: 6
(Heft-)Nummer: 28742
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 02 Aug 2016 05:30
ID-Nummer: 10.1038/srep28742
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