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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. LU orcid ; Nayak, Sanjib and Rödel, Jürgen , et al. (2020) In Communications Physics 3(1).
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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Communications Physics
volume
3
issue
1
article number
193
publisher
Nature Publishing Group
external identifiers
  • scopus:85094654877
ISSN
2399-3650
DOI
10.1038/s42005-020-00459-2
language
English
LU publication?
yes
id
a8ddaaa1-2ff7-4b96-a92b-cc3006d266bd
date added to LUP
2020-11-13 10:24:58
date last changed
2022-04-26 21:49:18
@article{a8ddaaa1-2ff7-4b96-a92b-cc3006d266bd,
  abstract     = {{<p>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 (T<sub>C</sub>), isotropic distortion of polar clusters is the dominant mechanism above T<sub>C</sub>.</p>}},
  author       = {{Venkateshwarlu, Sarangi and Venkataraman, Lalitha K. and Segouin, Valentin and Marlton, Frederick P. and Hin, Ho Chin and Chernyshov, Dmitry and Ren, Yang and Jørgensen, Mads R.V. and Nayak, Sanjib and Rödel, Jürgen and Daniel, Laurent and Pramanick, Abhijit}},
  issn         = {{2399-3650}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Communications Physics}},
  title        = {{Large electromechanical strain and unconventional domain switching near phase convergence in a Pb-free ferroelectric}},
  url          = {{http://dx.doi.org/10.1038/s42005-020-00459-2}},
  doi          = {{10.1038/s42005-020-00459-2}},
  volume       = {{3}},
  year         = {{2020}},
}