Crystalline relaxor-ferroelectric phase transition transducer
US8604676B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2011 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Jan 7, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/204
Abstract
A piezoelectric transducer includes a single crystal piezoelectric material having a phase transition from one crystalline phase to a second crystalline phase at a predetermined stress level. A pre-stress is applied to the single crystal piezoelectric material so that the material is maintained near its phase transition point. An electrical field source is joined to the material such that, in cooperation with the pre-stress, an increase or decrease in the electrical field causes a crystalline phase transition in the single crystal piezoelectric material. Crystalline phase transition induces strain larger by an order of magnitude than that caused by the non-phase transition piezoelectric effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.