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

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.

Venkataraman, Lalitha K.Technical University of Darmstadt (författare)
Segouin, ValentinUniversity of Paris-Saclay,Paris-Sorbonne University (författare)
Marlton, Frederick P.Aarhus University (författare)
Hin, Ho ChinCity University of Hong Kong (författare)
Chernyshov, DmitryEuropean Synchrotron Radiation Facility,St. Petersburg State Polytechnical University (författare)
Ren, YangArgonne National Laboratory (författare)
Jørgensen, Mads R.V.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Aarhus University(Swepub:lu)ma1061jo (författare)
Nayak, SanjibCity University of Hong Kong (författare)
Rödel, JürgenTechnical University of Darmstadt (författare)
Daniel, LaurentParis-Sorbonne University,University of Paris-Saclay (författare)
Pramanick, AbhijitCity University of Hong Kong (författare)
City University of Hong KongTechnical University of Darmstadt (creator_code:org_t)

Ingår i:Communications Physics: Springer Science and Business Media LLC3:12399-3650

Av författaren/redakt...: Venkateshwarlu, ...; Venkataraman, La ...; Segouin, Valenti ...; Marlton, Frederi ...; Hin, Ho Chin; Chernyshov, Dmit ...; visa fler...; Ren, Yang; Jørgensen, Mads ...; Nayak, Sanjib; Rödel, Jürgen; Daniel, Laurent; Pramanick, Abhij ...; visa färre...

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