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 (01.10.2002-03.10.2002)
doi: 10.1109/ISE.2002.1042981
Conference or Workshop Item, Bibliographie
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.
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2002 |
| Creators: | Seggern, H. von ; Fedosov, S. N. |
| Type of entry: | Bibliographie |
| Title: | Conductivity induced polarization in two-phase ferroelectric materials |
| Language: | English |
| Date: | 1 October 2002 |
| Place of Publication: | Piscataway |
| Book Title: | Proceedings. 11th International Symposium on Electrets |
| Series: | ISE Proceedings |
| Series Volume: | 11 |
| Event Title: | 2002 llth International Symposium on Electrets |
| Event Location: | Novotel Hotel, Glen Waverley, Melbourne, Australia |
| Event Dates: | 01.10.2002-03.10.2002 |
| DOI: | 10.1109/ISE.2002.1042981 |
| 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. |
| Uncontrolled Keywords: | dielectric polarisation, electric charge, electrical conductivity, ferroelectric materials, ferroelectric switching, interface phenomena, polymers |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Electronic Materials |
| Date Deposited: | 19 Jun 2013 08:34 |
| Last Modified: | 13 Aug 2021 14:08 |
| PPN: | |
| Funders: | Sponsored by IEEE Dielectrics and Electrical Insulation Society. , Technically co-sponsored by IEEE Ultrasonics and Frequency Control Society |
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