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Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores

Khachaturyan, R. and Zhukov, Sergey and Schultheiß, Jan and Galassi, C. and Reimuth, C. and Koruza, Jurij and Seggern, Heinz von and Genenko, Yuri A. (2017):
Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores.
In: Journal of Physics D: Applied Physics, IOP Publishing, pp. 045303 (1--14), 50, ISSN 0022-3727,
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2017
Creators: Khachaturyan, R. and Zhukov, Sergey and Schultheiß, Jan and Galassi, C. and Reimuth, C. and Koruza, Jurij and Seggern, Heinz von and Genenko, Yuri A.
Title: Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores
Language: English
Abstract:

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.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 50
Publisher: IOP Publishing
Uncontrolled Keywords: porous ferroelectrics, polarization-switching dynamics, oriented anisometric pores, statistical field-distributions
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 03 Jan 2017 07:21
Identification Number: doi:10.1088/1361-6463/aa519c
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