Piezoelectric ceramic composition

Details Piezoelectric ceramic composition Piezoelectric ceramic composition

1998-07-07

1999-08-31

Koslow, C. Melissa

Compositions

Piezoelectric

501134, 501136, C04B 3546, H01L 41187

Patent

active

059450304

ABSTRACT:
Disclosed are piezoelectric ceramic compositions comprising, as the essential component, (Na.sub.0.5 Bi.sub.0.5)Bi.sub.4 Ti.sub.4 O.sub.15, or (Na.sub.0.5 Bi.sub.0.5).sub.1-x M.sub.x Bi.sub.4 Ti.sub.4 O.sub.15 where M is at least one divalent metal element or (A1.sub.0.5 A2.sub.0.5) and A1 is at least one monovalent metal element, A2 is at least one trivalent metal element, and 0<x.ltoreq.0.5, and, as the side component, manganese in an amount of from about 0.7 to 3.0% by weight, relative to the essential component and in terms of MnCO.sub.3. The compositions have a piezoelectric constant, d.sub.33, of not smaller than 25 pC/N at temperatures above 500.degree. C.

REFERENCES:
patent: 5369068 (1994-11-01), Kaneko

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