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Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites

Wang, Shuai and Rödel, Jürgen and Xu, Bai-Xiang (2016):
Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites.
In: 13th International Symposium on Ferroic Domains & Micro- to Nano-scopic Structures, Vancouver, British Columbia, Canada., Oct. 2-6, 2016, [Conference or Workshop Item]

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Abstract

Relaxor ferroelectrics are a class of disordered crystals with very high piezoelectric effect [1]. In order to reveal its unique physical origins and to explore its application potential, a lot of investigations have been carried out both theoretically and experimentally. In the simulation approach, although there is plenty of work on phase field modeling of conventional ferroelectrics, phase field simulations on relaxor ferroelectrics are scarce in the literature, due to the complex physical origins of relaxor features. Based on our previous work on ferroelectrics, here we present a phase-field model for relaxor ferroelectrics based on random field theory [2]. Even though relaxors may have different origins depending on the materials, in a generic sense they all lead to internal random fields. It is assumed that the random field obeys the Gaussian distribution and its strength can be modified by the variance of the distribution. Finite element simulations demonstrate that the model can reproduce relaxor features, such as domain miniaturization, small remanent polarization and large piezoelectric response. By combining the relaxor model with a ferroelectric model, the behavior of a relaxor/ferroelectric composite can be investigated. The enhancement of large-signal piezoelectric constant d33* is found at certain volume ratio of ferroelectric addition in BNT-BT-KNN|BNT-7BT system [3]. In other systems, e.g. Al-containing composite, the interfaces between ferroelectric and relaxor are diffuse. The influence of coherent interface and diffuse interface on the domain structure is studied for different composite systems.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Wang, Shuai and Rödel, Jürgen and Xu, Bai-Xiang
Title: Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites
Language: English
Abstract:

Relaxor ferroelectrics are a class of disordered crystals with very high piezoelectric effect [1]. In order to reveal its unique physical origins and to explore its application potential, a lot of investigations have been carried out both theoretically and experimentally. In the simulation approach, although there is plenty of work on phase field modeling of conventional ferroelectrics, phase field simulations on relaxor ferroelectrics are scarce in the literature, due to the complex physical origins of relaxor features. Based on our previous work on ferroelectrics, here we present a phase-field model for relaxor ferroelectrics based on random field theory [2]. Even though relaxors may have different origins depending on the materials, in a generic sense they all lead to internal random fields. It is assumed that the random field obeys the Gaussian distribution and its strength can be modified by the variance of the distribution. Finite element simulations demonstrate that the model can reproduce relaxor features, such as domain miniaturization, small remanent polarization and large piezoelectric response. By combining the relaxor model with a ferroelectric model, the behavior of a relaxor/ferroelectric composite can be investigated. The enhancement of large-signal piezoelectric constant d33* is found at certain volume ratio of ferroelectric addition in BNT-BT-KNN|BNT-7BT system [3]. In other systems, e.g. Al-containing composite, the interfaces between ferroelectric and relaxor are diffuse. The influence of coherent interface and diffuse interface on the domain structure is studied for different composite systems.

Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
Exzellenzinitiative
Exzellenzinitiative > Graduate Schools
Exzellenzinitiative > Graduate Schools > Graduate School of Computational Engineering (CE)
Event Title: 13th International Symposium on Ferroic Domains & Micro- to Nano-scopic Structures
Event Location: Vancouver, British Columbia, Canada.
Event Dates: Oct. 2-6, 2016
Date Deposited: 19 Sep 2016 05:47
Alternative keywords:
Alternative keywordsLanguage
ferroelectrics, phase field modellingUNSPECIFIED
Funders: The work of Shuai Wang is supported by the 'Excellence Initiative' of the German Federal and State Governments and the Graduate School of Computational Engineering at Technische Universität Darmstadt.
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