Device for polarizing ferroelectric materials

Details Device for polarizing ferroelectric materials Device for polarizing ferroelectric materials

1986-07-30

1987-08-04

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

29 2535, 264 22, 264 401, 264 402, 310318, 310357, 361233, 425169, 4251746, 4251748E, 4251748R, B29C 7104, H04R 1700

Patent

active

046843370

ABSTRACT:
Means for polarizing ferroelectric materials up to a predetermined polarization level include the application of an electric field E to these materials. According to this method the ferroelectric material is subjected to an alternating electric field E, the frequency of which ranges from about 0.001 to 1 Hz, and which is made to increase gradually and in a cyclic way between 0.+-.E.sub.N, E.sub.N being slightly in excess of the coercive force E.sub.C of said material. Simultaneously, the intensity i of the current traversing the material (2) is measured as a function of the applied field (E) using a unit of visualization, until a stable curve i=f(E) is attained. The invention is particularly suitable for obtaining a stable polarization of ferroelectric polymers, copolymers, crystals, and polycrystals, with the objective of using the piezoelectric and/or pyroelectric properties of these materials.

REFERENCES:
patent: 2706326 (1955-04-01), Mason
patent: 2964832 (1960-12-01), Oberg et al.
patent: 3531779 (1970-09-01), Hopkins et al.
patent: 3585611 (1971-06-01), Lefkowitz et al.
patent: 3761746 (1973-09-01), Adler
patent: 3958161 (1976-05-01), Dixon
patent: 4086124 (1978-04-01), Peuzin et al.
patent: 4321155 (1982-03-01), Yamashita et al.
patent: 4381534 (1983-04-01), Danz et al.
"Saturation Remnant Polarization of PVDF", Org. Coatings and Plastics Chem., pp. 278-280, 1978, by Kepler.

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