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

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

DOI

  • Sarangi Venkateshwarlu, City University of Hong Kong
  • ,
  • Lalitha K. Venkataraman, Technische Universität Darmstadt
  • ,
  • Valentin Segouin, Universite Paris-Saclay, Sorbonne Université
  • ,
  • Frederick P. Marlton
  • ,
  • Ho Chin Hin, City University of Hong Kong
  • ,
  • Dmitry Chernyshov, St. Petersburg State Polytechnical University, SNBL, ESRF
  • ,
  • Yang Ren, Argonne National Laboratory
  • ,
  • Mads R.V. Jørgensen
  • Sanjib Nayak, City University of Hong Kong
  • ,
  • Jürgen Rödel, Technische Universität Darmstadt
  • ,
  • Laurent Daniel, Universite Paris-Saclay, Sorbonne Université
  • ,
  • Abhijit Pramanick, City University of Hong Kong

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.

OriginalsprogEngelsk
Artikelnummer193
TidsskriftCommunications Physics
Vol/bind3
Antal sider14
ISSN0010-3616
DOI
StatusUdgivet - okt. 2020

Se relationer på Aarhus Universitet Citationsformater

ID: 200435859