Piezoelectric ceramics

Details Piezoelectric ceramics Piezoelectric ceramics

1997-10-10

1998-11-10

Bonner, Melissa

Compositions

Piezoelectric

Lead, zirconium, titanium or compound thereof containing

501134, H01L 4110

Patent

active

058338756

ABSTRACT:
A piezoelectric ceramic which maintains a high piezoelectric property in a composition having MPB structure and has an excellent ability for stabilizing the resonant frequency is provided. The piezoelectric ceramic has a solid solution expressed by the general expression xPbTiO.sub.3 --(1-x) PbZrO.sub.3 as its main component. The value of x in the above general expression causes the piezoelectric ceramic to have a composition having the morphotropic phase boundary structure. A ceramic having a spinel type structure is dispersed within the structure of the piezoelectric ceramic. The amount of the ceramic having the spinel type structure existing in the structure is set at about 5 volume % or less. Co.sub.2 TiO.sub.4, Mn.sub.3 O.sub.4, Fe.sub.3 O.sub.4, Mg.sub.2 TiO.sub.4 and a ceramic having a compound spinel type structure which is a solid solution of them can be used as the ceramic having the spinel type structure.

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