Wang, Shuai ; Rödel, Jürgen ; Xu, Bai-Xiang (2016)
Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites.
13th International Symposium on Ferroic Domains & Micro- to Nano-scopic Structures. Vancouver, British Columbia, Canada. (02.10.2016-06.10.2016)
Konferenzveröffentlichung, Bibliographie
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Kurzbeschreibung (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.
| Typ des Eintrags: | Konferenzveröffentlichung | ||||
|---|---|---|---|---|---|
| Erschienen: | 2016 | ||||
| Autor(en): | Wang, Shuai ; Rödel, Jürgen ; Xu, Bai-Xiang | ||||
| Art des Eintrags: | Bibliographie | ||||
| Titel: | Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites | ||||
| Sprache: | Englisch | ||||
| Publikationsjahr: | 9 August 2016 | ||||
| Veranstaltungstitel: | 13th International Symposium on Ferroic Domains & Micro- to Nano-scopic Structures | ||||
| Veranstaltungsort: | Vancouver, British Columbia, Canada. | ||||
| Veranstaltungsdatum: | 02.10.2016-06.10.2016 | ||||
| Kurzbeschreibung (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. |
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| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft Exzellenzinitiative Exzellenzinitiative > Graduiertenschulen Exzellenzinitiative > Graduiertenschulen > Graduate School of Computational Engineering (CE) |
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| Hinterlegungsdatum: | 19 Sep 2016 05:47 | ||||
| Letzte Änderung: | 26 Jan 2024 09:21 | ||||
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| Sponsoren: | 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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| Suche nach Titel in: | TUfind oder in Google | ||||
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- Phase field modeling of relaxor ferroelectrics and ferroelectric/relaxor composites. (deposited 19 Sep 2016 05:47) [Gegenwärtig angezeigt]
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