Process for making a piezoelectric body

Details Process for making a piezoelectric body Process for making a piezoelectric body

1974-03-28

1976-03-09

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 95, 317262F, 29 2535, H01L 4104, H04R 1700

Patent

active

039433870

ABSTRACT:
Process for the production of a piezoelectric body which contains a ferroelectric material which may be polarized in an aligned, permanent fashion and also contains a bonding material, the process comprises mixing a bonding material selected so that at least in a temperature range below the Curie temperature of the ferroelectric material, it has a specific electric conductivity .sigma..sub.B > E.sub.C .times. .sigma..sub.K /E.sub.B, where .sigma..sub.K is the specific conductivity of the ferroelectric material, E.sub.C is the coercivity field strength of the ferroelectric material, and E.sub.B is the electric breakdown field strength of the bonding material with a granular ferroelectric material having a known Curie temperature, forming a desired body shape from such mixture, heating the resultant body to a temperature at least sufficient for the bonding material to exhibit its specific conductivity and applying an electric voltage of sufficient intensity to the body to produce a permanent polarization alignment in the ferroelectric material within such body.

REFERENCES:
patent: 1886234 (1932-11-01), Meissner
patent: 1969379 (1934-08-01), Meissner
patent: 2420652 (1947-05-01), Chilowsky
patent: 2434143 (1948-01-01), Chilowsky
patent: 2533140 (1950-12-01), Rodriguez
patent: 3070775 (1962-12-01), Andrews, Jr.
patent: 3213027 (1965-10-01), Fatuzzo et al.

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