Wang, Shuai ; Xu, Bai-Xiang (2016)
A phase-field model on relaxor ferroelectrics based on random field theory.
2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Applications of Polar Dielectrics & Workshop on Piezoresponse Force Microscopy. Darmstadt (21.08.2016-25.08.2016)
Konferenzveröffentlichung, Bibliographie
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Kurzbeschreibung (Abstract)
Relaxor ferroelectrics are a class of disordered crystals with very high piezoelectric effect. 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 show a phase-field model for relaxor ferroelectrics based on random field theory. Spontaneous polarization is chosen as the order parameter. The random field obeys the Gaussian distribution and its strength can be modified by the variance of the distribution Δ. Finite element simulations based on this model demonstrate that the model can reproduce relaxor features, such as domain miniaturization (Fig. 1), small remnant polarization and large piezoelectric response. Different simulation cases including relaxation process, bipolar loading, pure mechanical loading and electro-mechanical loading shows the capability of the model. Simulation results show that the domain size becomes smaller as the random field becomes stronger in relaxation process, which is in consistent with experimental characterization. Under pure electric loading, the remnant polarization and coercive field becomes smaller as the random field becomes stronger. The remnant polarization decreases with the increase of random fields. When bipolar loading is applied on a preloaded sample, the macroscopic properties such as remnant and maximum polarization can be modified. For instance, the sample with lower random field have smaller remnant polarization, while the sample with higher random field have smaller maximum polarization under compression loading.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Wang, Shuai ; Xu, Bai-Xiang |
| Art des Eintrags: | Bibliographie |
| Titel: | A phase-field model on relaxor ferroelectrics based on random field theory |
| Sprache: | Englisch |
| Publikationsjahr: | 9 August 2016 |
| Veranstaltungstitel: | 2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Applications of Polar Dielectrics & Workshop on Piezoresponse Force Microscopy |
| Veranstaltungsort: | Darmstadt |
| Veranstaltungsdatum: | 21.08.2016-25.08.2016 |
| URL / URN: | http://www.ieee2016.tu-darmstadt.de/ieee_homepage/inhalt_mit... |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Relaxor ferroelectrics are a class of disordered crystals with very high piezoelectric effect. 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 show a phase-field model for relaxor ferroelectrics based on random field theory. Spontaneous polarization is chosen as the order parameter. The random field obeys the Gaussian distribution and its strength can be modified by the variance of the distribution Δ. Finite element simulations based on this model demonstrate that the model can reproduce relaxor features, such as domain miniaturization (Fig. 1), small remnant polarization and large piezoelectric response. Different simulation cases including relaxation process, bipolar loading, pure mechanical loading and electro-mechanical loading shows the capability of the model. Simulation results show that the domain size becomes smaller as the random field becomes stronger in relaxation process, which is in consistent with experimental characterization. Under pure electric loading, the remnant polarization and coercive field becomes smaller as the random field becomes stronger. The remnant polarization decreases with the increase of random fields. When bipolar loading is applied on a preloaded sample, the macroscopic properties such as remnant and maximum polarization can be modified. For instance, the sample with lower random field have smaller remnant polarization, while the sample with higher random field have smaller maximum polarization under compression loading. |
| Freie Schlagworte: | ferroelectrics, phase field simulation |
| 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) |
| Hinterlegungsdatum: | 06 Sep 2016 06:06 |
| Letzte Änderung: | 26 Jan 2024 09:21 |
| PPN: | |
| 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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