Large electromechanical strain and unconventional domain switching near phase convergence in a Pb-free ferroelectric
(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.
(Less)
- author
- organization
- publishing date
- 2020
- 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}}, }