Large electromechanical strain and unconventional domain switching near phase convergence in a Pb-free ferroelectric

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lalitha K. Venkataraman
  • Valentin Segouin
  • Frederick P. Marlton
  • Ho Chin Hin
  • Dmitry Chernyshov
  • Yang Ren
  • Mads R. V. Jørgensen
  • Sanjib Nayak
  • Jürgen Rödel
  • Laurent Daniel

Detail(s)

Original languageEnglish
Article number193
Journal / PublicationCOMMUNICATIONS PHYSICS
Volume3
Online published30 Oct 2020
Publication statusPublished - 2020

Link(s)

Abstract

In many ferroelectrics, large electromechanical strains are observed near regions of composition- or temperature- driven phase coexistence. Phenomenologically, this is attributed to easy re-orientation of the polarization vector and/or phase transition, although their effects are highly convoluted and difficult to distinguish experimentally. Here, we used synchrotron X-ray scattering and digital image correlation to differentiate between the microscopic mechanisms leading to large electrostrains in an exemplary Pb-free piezoceramic Sn-doped barium calcium zirconate titanate. Large electrostrains of ~0.2% measured at room-temperature are attributed to an unconventional effect, wherein polarization switching is aided by a reversible phase transition near the tetragonal-orthorhombic phase boundary. Additionally, electrostrains of ~0.1% or more could be maintained from room temperature to 140 °C due to a succession of different microscopic mechanisms. In situ X-ray diffraction elucidates that while 90° domain reorientation is pertinent below the Curie temperature (TC), isotropic distortion of polar clusters is the dominant mechanism above TC.

Research Area(s)

Citation Format(s)

Large electromechanical strain and unconventional domain switching near phase convergence in a Pb-free ferroelectric. / Venkateshwarlu, Sarangi; Venkataraman, Lalitha K.; Segouin, Valentin; Marlton, Frederick P.; Hin, Ho Chin; Chernyshov, Dmitry; Ren, Yang; Jørgensen, Mads R. V.; Nayak, Sanjib; Rödel, Jürgen; Daniel, Laurent; Pramanick, Abhijit.

In: COMMUNICATIONS PHYSICS, Vol. 3, 193, 2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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