Method of depolarizing a ferroelectric material using electrical

Details Method of depolarizing a ferroelectric material using electrical Method of depolarizing a ferroelectric material using electrical

1994-01-05

1996-01-23

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Measuring, testing, or inspecting

425169, 4251748R, 4251748E, B29C 7104

Patent

active

054863201

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.

REFERENCES:
patent: 3943614 (1976-03-01), Yoshikawa et al.
patent: 4241128 (1980-12-01), Wang
patent: 4308370 (1981-12-01), Fukada et al.
patent: 4611260 (1986-09-01), Bauer
patent: 4684337 (1987-08-01), Bauer
patent: 5310511 (1994-05-01), Marcus

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