Method of depolarizing a ferroelectric material using electrical means and its application to obtain a ferroelectric material of reinforced dielectric strength
US5486320A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Jan 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical procedure depolarizes completely or partially a ferroelectric material which had been polarized before in at least one of its regions. A low-frequency alternating electric field is applied to the material whose amplitude exceeds the coercive field E.sub.c and is then decreased step by step. In a preferred embodiment the selected maximum value is 1.3 times that of the coercive field E.sub.c. It is also possible to depolarize the material selectively so that there are polarized zones remaining. The procedure may be applied to produce materials for piezoelectric or pyroelectric transducers as well as to obtain materials with improved dielectric strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.