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:
Jun. 15, 1993
Filed:
Apr. 08, 1992
NEC Corporation, Tokyo, JP;
Abstract
A ceramic composition is herein disclosed, which is a lead-type perovskite compound capable of being subjected to low temperature-sintering among ceramic compositions for use in making capacitors, which has a high dielectric constant, low temperature-dependency thereof and a low decrease in capacitance upon application of a DC bias and which comprises a ternary system comprising lead magnesium niobate (Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3), lead nickel niobate (Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3) and lead titanate (PbTiO.sub.3).sub.z or a ternary system comprising lead magnesium tungstate (Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3) lead titanate (PbTiO.sub.3) and lead nickel niobate (Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3) and a desired amount of lanthanum manganese niobate La(Mn.sub.2/3 Nb.sub.1/3)O.sub.3) incorporated into the ternary system or a predetermined amount of La.sup.3+ or Ca.sup.2+ ions with which the Pb.sup.2+ ions present in the ternary system are substituted.