Process for polarizing a ferroelectric material in the shape of a cylinder
US6493205B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Apr 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/60
Abstract
Process for polarizing at least a part of a ferroelectric material in a cylindrical shape having a longitudinal axis, and having an internal conductor inside the cylinder disposed along the longitudinal axis. At least part of said cylinder is placed in a conductive liquid with the cylinder being free from any stresses other than pressure exerted by the conductive liquid. A low frequency AC voltage is then applied between an electrode in contact with the conductive liquid and the internal conductor, and the amplitude of the voltage is increased progressively up to a value such that an electrical field is created having an amplitude greater than a coercive field of polarization Ec of the ferroelectric material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.