Giant room temperature compression and bending in ferroelectric oxide pillars

Ying Liu, Xiangyuan Cui, Ranming Niu, Shujun Zhang, Xiaozhou Liao, Scott D. Moss, Peter Finkel, Magnus Garbrecht, Simon P. Ringer and Julie M. Cairney ()
Additional contact information
Ying Liu: The University of Sydney
Xiangyuan Cui: The University of Sydney
Ranming Niu: The University of Sydney
Shujun Zhang: University of Wollongong
Xiaozhou Liao: The University of Sydney
Scott D. Moss: Aerospace Division, Defence Science and Technology Group
Peter Finkel: US Naval Research Laboratory
Magnus Garbrecht: The University of Sydney
Simon P. Ringer: The University of Sydney
Julie M. Cairney: The University of Sydney

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Plastic deformation in ceramic materials is normally only observed in nanometre-sized samples. However, we have observed high levels of plasticity (>50% plastic strain) and excellent elasticity (6% elastic strain) in perovskite oxide Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3, under compression along pc pillars up to 2.1 μm in diameter. The extent of this deformation is much higher than has previously been reported for ceramic materials, and the sample size at which plasticity is observed is almost an order of magnitude larger. Bending tests also revealed over 8% flexural strain. Plastic deformation occurred by slip along {110} . Calculations indicate that the resulting strain gradients will give rise to giant flexoelectric polarization. First principles models predict that a high concentration of oxygen vacancies weaken the covalent/ionic bonds, giving rise to the unexpected plasticity. Mechanical testing on oxygen vacancies-rich Mn-doped Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 confirmed this prediction. These findings will facilitate the design of plastic ceramic materials and the development of flexoelectric-based nano-electromechanical systems.

Date: 2022
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DOI: 10.1038/s41467-022-27952-2

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