The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1999
Filed:
Feb. 24, 1998
Abstract
Improved are the piezoelectric characteristics of conventional ceramics of (Ba.sub.1-x Sr.sub.x).sub.2 NaNb.sub.5 O.sub.15 where 0.ltoreq.x.ltoreq.1, and provided is a novel piezoelectric ceramic composition which does not contain lead and which can be practiced industrially as a material for piezoelectric ceramic devices such as piezoelectric ceramic filters, etc. The piezoelectric ceramic composition comprises, as the essential component, a ceramic component of the general formula, (1-y)(Ba.sub.1-x Sr.sub.x)Nb.sub.2 O.sub.6 --yNaNbO.sub.3 where 0.ltoreq.x.ltoreq.1 and 0.15.ltoreq.y<1/3. Preferably, the composition contains, as the side component, at least one oxides of Mn, Cr, W, Si, Mo, Ni, Co, Sn, Mg, Sb, Ti, Zr and Fe, in a total amount of not larger than about 5% by weight in terms of MnO.sub.2, Cr.sub.2 O.sub.3, WO.sub.3, SiO.sub.2, MoO.sub.3, NiO, Co.sub.2 O.sub.3, SnO.sub.2, MgO, Sb.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2 and Fe.sub.2 O.sub.3, respectively.