Seggern, H. von ; Fedosov, S. N. (2002)
Conductivity induced polarization in two-phase ferroelectric materials.
2002 llth International Symposium on Electrets. Novotel Hotel, Glen Waverley, Melbourne, Australia (October 1-3 2002)
doi: 10.1109/ISE.2002.1042981
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
It is commonly believed that formation of polarization and its switching in ferroelectrics is a fast phenomenon. In the present study it was found, however, that in semicrystalline ferroelectric polymers, containing both crystalline and amorphous phases, polarization continues to grow under an applied field during times 5-6 orders of magnitude longer than the reported switching times. It is demonstrated that the controversy can be resolved by taking into account the effect of conductivity in such materials. It is shown that there are two temporal contributions to the ferroelectric polarization, of which the first one is field dependent and originates from a fast alignment of dipoles in crystallites, while the second slow component is controlled by conductivity. Appropriate modeling reveals the importance of charge accumulated at the interfacial boundaries to form the slow ferroelectric polarization contribution. Good agreement of calculated and measured polarization has been observed for PVDF.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2002 |
| Autor(en): | Seggern, H. von ; Fedosov, S. N. |
| Art des Eintrags: | Bibliographie |
| Titel: | Conductivity induced polarization in two-phase ferroelectric materials |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Oktober 2002 |
| Ort: | Piscataway |
| Buchtitel: | Proceedings. 11th International Symposium on Electrets |
| Reihe: | ISE Proceedings |
| Band einer Reihe: | 11 |
| Veranstaltungstitel: | 2002 llth International Symposium on Electrets |
| Veranstaltungsort: | Novotel Hotel, Glen Waverley, Melbourne, Australia |
| Veranstaltungsdatum: | October 1-3 2002 |
| DOI: | 10.1109/ISE.2002.1042981 |
| Kurzbeschreibung (Abstract): | It is commonly believed that formation of polarization and its switching in ferroelectrics is a fast phenomenon. In the present study it was found, however, that in semicrystalline ferroelectric polymers, containing both crystalline and amorphous phases, polarization continues to grow under an applied field during times 5-6 orders of magnitude longer than the reported switching times. It is demonstrated that the controversy can be resolved by taking into account the effect of conductivity in such materials. It is shown that there are two temporal contributions to the ferroelectric polarization, of which the first one is field dependent and originates from a fast alignment of dipoles in crystallites, while the second slow component is controlled by conductivity. Appropriate modeling reveals the importance of charge accumulated at the interfacial boundaries to form the slow ferroelectric polarization contribution. Good agreement of calculated and measured polarization has been observed for PVDF. |
| Freie Schlagworte: | dielectric polarisation, electric charge, electrical conductivity, ferroelectric materials, ferroelectric switching, interface phenomena, polymers |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Elektronische Materialeigenschaften |
| Hinterlegungsdatum: | 19 Jun 2013 08:34 |
| Letzte Änderung: | 13 Aug 2021 14:08 |
| PPN: | |
| Sponsoren: | Sponsored by IEEE Dielectrics and Electrical Insulation Society. , Technically co-sponsored by IEEE Ultrasonics and Frequency Control Society |
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