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Coupling effect in Relaxor-Ferroelectric layered composite – phase field simulation and analytical solution

Wang, Shuai and Xu, Bai-Xiang (2017):
Coupling effect in Relaxor-Ferroelectric layered composite – phase field simulation and analytical solution.
In: The Fourteenth International Meeting on Ferroelectricity, San Antonio, Texas, USA, In: The International Meeting on Ferroelectricity - 2017, San Antonio, Texas, USA, 04-08, Sep. 2017, [Online-Edition: http://www.imf2017.org/],
[Conference or Workshop Item]

Official URL: http://www.imf2017.org/

Abstract

Layered Relaxor-Ferroelectric composite has been shown experimentally to be able to enhance large-signal response d33* in lead-free ceramics, for instance by Zhang et al.. [1] The enhancement of the d33* is found at some specific ratio of each component. The underlying mechanism of the abnormal behavior in the layered structure is elucidated as the strain coupling effect accompanied with polarization coupling effect between the layers.

In this presentation, two approaches are established to investigate the coupling effect of the Relaxor-Ferroelectric layered structure. In the analytical approach, two criteria are given independently for the serial layered model, i.e., polarization equality condition by which only the polarization coupling effect is included, and strain equality condition by which only the strain coupling effect is included. The typical hysteresis loops, such as P-E loops and S-E loops of the composite can be calculated by the hysteresis loops of each component. In the phase-field approach, the detailed polarization and strain distribution in relaxor layer and ferroelectric layer can be calculated by our previous random field model. [2] Both polarization and strain coupling effect are intrinsically included in the model. Two lead-free material systems i.e. 93BNT-7BT|94BNKA-6BA and 93BNT-7BT|91BNT-6BT-3AN are used, and the enhancement of the d33* is observed and discussed.

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.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Wang, Shuai and Xu, Bai-Xiang
Title: Coupling effect in Relaxor-Ferroelectric layered composite – phase field simulation and analytical solution
Language: English
Abstract:

Layered Relaxor-Ferroelectric composite has been shown experimentally to be able to enhance large-signal response d33* in lead-free ceramics, for instance by Zhang et al.. [1] The enhancement of the d33* is found at some specific ratio of each component. The underlying mechanism of the abnormal behavior in the layered structure is elucidated as the strain coupling effect accompanied with polarization coupling effect between the layers.

In this presentation, two approaches are established to investigate the coupling effect of the Relaxor-Ferroelectric layered structure. In the analytical approach, two criteria are given independently for the serial layered model, i.e., polarization equality condition by which only the polarization coupling effect is included, and strain equality condition by which only the strain coupling effect is included. The typical hysteresis loops, such as P-E loops and S-E loops of the composite can be calculated by the hysteresis loops of each component. In the phase-field approach, the detailed polarization and strain distribution in relaxor layer and ferroelectric layer can be calculated by our previous random field model. [2] Both polarization and strain coupling effect are intrinsically included in the model. Two lead-free material systems i.e. 93BNT-7BT|94BNKA-6BA and 93BNT-7BT|91BNT-6BT-3AN are used, and the enhancement of the d33* is observed and discussed.

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.

Title of Book: The Fourteenth International Meeting on Ferroelectricity
Place of Publication: San Antonio, Texas, USA
Divisions: Exzellenzinitiative
Exzellenzinitiative > Graduate Schools
Exzellenzinitiative > Graduate Schools > Graduate School of Computational Engineering (CE)
Event Title: The International Meeting on Ferroelectricity - 2017
Event Location: San Antonio, Texas, USA
Event Dates: 04-08, Sep. 2017
Date Deposited: 03 Jun 2019 12:57
Official URL: http://www.imf2017.org/
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