Title: Process for making a piezoelectric body

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.

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Inventors: Veith, Richard (Unterhaching, DT)

Application Number: 455592
Filing Date: 1974-03-28
Publication_date: 1976-03-09
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DT)
Primary Class(es): 310/358 29/25.35, 361/233
Other Classes:
US Patent Ref:

1886234	Nov, 1932	Meissner	310/8.
1969379	Aug, 1934	Meissner	310/8.
2420652	May, 1947	Chilowsky	310/8.
2434143	Jan, 1948	Chilowsky	310/9.
2533140	Dec, 1950	Rodriguez	310/8.
3070775	Dec, 1962	Andrew, Jr.	310/8.
3213027	Oct, 1965	Fatuzzo et al.	310/8.

Other Refs:
Primary Examiner: Budd, Mark O.
Assistant Examiner:
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson