Accession Number : ADD007918

Title :   Lead Germanate Bonded PZT Composite Piezoelectrics Background of the Invention.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Schulze,Walter A ; Biggers,James V

Report Date : 02 Jun 1980

Pagination or Media Count : 24

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.

Descriptors :   *Patent applications, *Composite materials, *Piezoelectric materials, *Germanates, *Lead compounds, Bonding, Titanates, Zirconates, Liquid phases, Processing, Sintering, Inventions, Grain boundaries, Low temperature

Subject Categories : Laminates and Composite Materials
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE