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Phase field simulation of layered relaxor/ferroelectric composite with diffusive interface

Wang, Shuai and Xu, Bai-Xiang (2016):
Phase field simulation of layered relaxor/ferroelectric composite with diffusive interface.
In: 2nd Seminar on Ferroic Functional Materials & 12th International Workshop on Direct and Inverse Problems in Piezoelectricity, Erlangen, Oct. 4th - 6th, 2016, [Conference or Workshop Item]

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Abstract

Piezoelectric materials have received considerable attention in both industry and academia due to the electromechanical effect. Large-signal response $d_{33}^*$ is one of the most important parameters for actuator applications. In the past decades, great efforts have been made in developing lead-free piezoceramics in view of environmental issues. Ever since a large strain was reported on a BNT-BT-KNN ceramics, different approaches are attempted in BNT-BT system to obtain the enhanced piezoelectric effect. For instance, BNT-BT-AN layered composite shows the enhanced $d_{33}^*$ at a FE volume content of ~30\%. \cite{1hang2015large} The coupling effect between different layers is believed to be the origin for this phenomenon. The interface between layers also affects the composite property, especially for BNKT-BA.

In this presentation, a phase field model is established to simulate the layered RE/FE composite. The relaxor model is based on our previous work, in which a Gaussian distributed random field is introduced to represent the chemical disorder.\cite{wang2016phase} For the case of the sharp interface (BNT-BT-KNN), the enhancement of $d_{33}^*$ is observed at a FE volume content of 10\%. Different coupling mechanism is found between serial and parallel structure. For the case of the diffusive interface, the properties of the material, such as random field, are assumed to linearly change in the direction that is perpendicular to the interface. The large signal response is compared between the two types of interfaces. The simulation results can favor the design of the future FE/RE composite.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Wang, Shuai and Xu, Bai-Xiang
Title: Phase field simulation of layered relaxor/ferroelectric composite with diffusive interface
Language: English
Abstract:

Piezoelectric materials have received considerable attention in both industry and academia due to the electromechanical effect. Large-signal response $d_{33}^*$ is one of the most important parameters for actuator applications. In the past decades, great efforts have been made in developing lead-free piezoceramics in view of environmental issues. Ever since a large strain was reported on a BNT-BT-KNN ceramics, different approaches are attempted in BNT-BT system to obtain the enhanced piezoelectric effect. For instance, BNT-BT-AN layered composite shows the enhanced $d_{33}^*$ at a FE volume content of ~30\%. \cite{1hang2015large} The coupling effect between different layers is believed to be the origin for this phenomenon. The interface between layers also affects the composite property, especially for BNKT-BA.

In this presentation, a phase field model is established to simulate the layered RE/FE composite. The relaxor model is based on our previous work, in which a Gaussian distributed random field is introduced to represent the chemical disorder.\cite{wang2016phase} For the case of the sharp interface (BNT-BT-KNN), the enhancement of $d_{33}^*$ is observed at a FE volume content of 10\%. Different coupling mechanism is found between serial and parallel structure. For the case of the diffusive interface, the properties of the material, such as random field, are assumed to linearly change in the direction that is perpendicular to the interface. The large signal response is compared between the two types of interfaces. The simulation results can favor the design of the future FE/RE composite.

Uncontrolled Keywords: Piezoelectricity, phase-field simulation
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: 2nd Seminar on Ferroic Functional Materials & 12th International Workshop on Direct and Inverse Problems in Piezoelectricity
Event Location: Erlangen
Event Dates: Oct. 4th - 6th, 2016
Date Deposited: 19 Sep 2016 05:46
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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