TY - JOUR
T1 - Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores
AU - Khachaturyan, R.
AU - Zhukov, S.
AU - Schultheiß, J.
AU - Galassi, C.
AU - Reimuth, C.
AU - Koruza, J.
AU - Von Seggern, H.
AU - Genenko, Y. A.
N1 - Funding Information:
This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within the grants SE 941/19-1 and GE 1171/7-1. The authors thank C Capiani (CNR-ISTEC) for the skillful preparation of the samples.
Publisher Copyright:
© 2016 IOP Publishing Ltd.
PY - 2017/2/2
Y1 - 2017/2/2
N2 - Highly porous ferroelectric ceramics possess remarkably less polarizability than dense ceramics; instead they display high tunability of various physical properties. Particularly, the shape and orientation of pores as well as the total porosity exhibit a great effect on the polarization-switching dynamics. In the present work, finite-element simulations of the electric-field distributions and related statistical distributions of local switching times are analysed and compared with the switching characteristics of porous lead zirconate titanate ceramics, extracted from the experiment by means of the inhomogeneous field mechanism model of polarization switching. Surprisingly, the simulated statistical field-distributions turn out to be virtually independent of the pore-size distribution; however, they are sensitive to the anisometric shape and orientation of the pores. Additionally, they exhibit notable broadening with increasing porosity; an effect confirmed by experimental observations.
AB - Highly porous ferroelectric ceramics possess remarkably less polarizability than dense ceramics; instead they display high tunability of various physical properties. Particularly, the shape and orientation of pores as well as the total porosity exhibit a great effect on the polarization-switching dynamics. In the present work, finite-element simulations of the electric-field distributions and related statistical distributions of local switching times are analysed and compared with the switching characteristics of porous lead zirconate titanate ceramics, extracted from the experiment by means of the inhomogeneous field mechanism model of polarization switching. Surprisingly, the simulated statistical field-distributions turn out to be virtually independent of the pore-size distribution; however, they are sensitive to the anisometric shape and orientation of the pores. Additionally, they exhibit notable broadening with increasing porosity; an effect confirmed by experimental observations.
KW - oriented anisometric pores
KW - polarization-switching dynamics
KW - porous ferroelectrics
KW - statistical field-distributions
UR - http://www.scopus.com/inward/record.url?scp=85008889362&partnerID=8YFLogxK
U2 - 10.1088/1361-6463/aa519c
DO - 10.1088/1361-6463/aa519c
M3 - Article
AN - SCOPUS:85008889362
SN - 0022-3727
VL - 50
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 4
M1 - 045303
ER -