Compositions – Piezoelectric – Lead – zirconium – titanium or compound thereof containing
Patent
1996-10-07
1998-06-16
Bonner, Melissa
Compositions
Piezoelectric
Lead, zirconium, titanium or compound thereof containing
501134, C04B 35491, C04B 35493, C04B 3549
Patent
active
057665028
ABSTRACT:
Piezoelectric ceramics whose mechanical quality factor Qm is small and which has an excellent heat resistance, e.g. piezoelectric ceramics for filtering elements whose group delay time characteristic is flat, phase distortion is small and which can be accommodated to surface mounting, and a method for stably producing it are provided. Manganese oxide and lead oxide are caused to coexist in high concentration in grain boundary parts of the piezoelectric ceramics containing composite oxides of at least lead, zirconium and titanium as compared to intra-crystal grains of the piezoelectric ceramics. It is manufactured by treating the piezoelectric ceramics by heat after adhering manganese and lead compounds on the surface thereof to diffuse the oxides in the grain boundary parts of the piezoelectric ceramics.
REFERENCES:
Derwent Publication Ltd., London, GB, 95-110426, "Piezoelectric Ceramic Piezoelectric Device Ceramic Oscillator Comprise Lead Zironate Titanate Contain Manganese". Jul. 19, 1993.
Derwent Publication Ltd., London, GB, 94-329814, "Produce Piezoelectric Ceramic Manufacture Ceramic Vibration Ceramic Filter Substitute Lead Antimony Tin Zirconium Composite Oxide Calcium Add Chromium Oxide Thermal Diffusion Manganese". Feb. 16, 1993.
Derwent Publications Ltd., London, GB, 94-071738, "Piezoelectric Ceramic Composition Actuate Comprise Perovskite Oxide Lead Zirconium Zinc Niobium Oxygen Substitute Calcium Barium Strontium Lead Site". Sep. 10, 1991.
Derwent Publication Ltd., London, GB, 93-239844, "Piezoelectric Ceramic Manufacture Actuate Contain Lead Zirconium Titanium Complex Oxide Add Iron Aluminium Manganese". May 7, 1992.
Ando Akira
Hase Kiyoshi
Hayashi Koichi
Nagai Akira
Takagi Hiroshi
Bonner Melissa
Murata Manufacturing Co. Ltd.
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