Lead Germanate Bonded PZT Composite Piezoelectrics Background of the Invention.

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Abstract:

The present invention gives a lead germanate bonded lead zirconate titanate family of composite piezoelectric ceramic materials with a ferroelectric component stabilized against depoling by an insulating grain boundary phase, and a low temperature or liquid phase sintering process for making the composite. The very weak or non-ferroelectric grain boundary phase becomes liquid during the low temperature sintering process and almost totally coats the lead zirconate titanate grains, stabilizing the composite against switching of the grains by inhibiting the transport of charge and isolating the grains from compensation by the bound charge of domains in adjacent grains. Objects of the invention are to provide 1 stabilization for poled lead zirconate titanate grains against depoling under high drive conditions 2 insulation of poled lead zirconate titanate grains in a ceramic piezoelectric 3 a lead zirconate titanate composites a stabilization mechanism that will not increase domain wall motion of the PZT grains 4 a dense lead zirconate titanate piezoelectric ceramic 5 a process for making lead germanate bonded lead zirconate titanate bonded composite materials 6 a low temperature sintering process for making lead zirconate titanate piezoelectric ceramic and 7 a liquid phase sintering process for making lead zirconate titanate piezoelectric ceramic.

Author(s):
Schulze, Walter A. ; Biggers, James V.
Author Organization(s):
DEPARTMENT OF THE NAVY WASHINGTON DC
Descriptive Note:
Patent Application,
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Availability: This Government-owned Invention Available For U.s. Licensing And, Possibly, For Foreign Licensing. Copy Of Application Available Ntis.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PAT-APPL-155 830
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*Patent applications, *Composite materials, *Piezoelectric materials, *Germanates, *Lead compounds, Bonding, Titanates, Zirconates, Liquid phases, Processing, Sintering, Inventions, Grain boundaries, Low temperature
Field(s)/Group(s):
Laminates and Composite Materials, Electricity and Magnetism
Report Date:
1980 Jun 02