초록 ▼

A low loss piezoelectric ceramic composition cofirable with silver at a reduced sintering temperature and a process for producing the same is provided. The composition is a binary piezoelectric ceramic composition consisting of a main composition which is characterized by 95.0 to 99.5 weight percent

A low loss piezoelectric ceramic composition cofirable with silver at a reduced sintering temperature and a process for producing the same is provided. The composition is a binary piezoelectric ceramic composition consisting of a main composition which is characterized by 95.0 to 99.5 weight percent of a system represented by a general formula Pb(Zr.sub.x Ti.sub.1-x)O.sub.3 +yMnO.sub.2 in which 0.ltoreq.x.ltoreq.1.0 and 0.1.ltoreq.y.ltoreq.1.0 wt. % The composition also contains 0.5 to 5.0 weight percent of an additive represented by a general formula wB.sub.2 O.sub.3 -xBi.sub.2 O.sub.3 -yMeO-zCuO wherein w,x,y, and z are weight percentages of the respective components and w+x+y+z=1. In the composition, Me is one of the metals selected from a group consisting of Ca, Sr, Ba, Zn, and 0.01.ltoreq.w.ltoreq.0.15, 0.ltoreq.x.ltoreq.0.80, 0.ltoreq.y.ltoreq.0.60 and 0.ltoreq.z.ltoreq.0.55. Significantly, the piezoelectric ceramic composition is non-reactive with a silver electrode layer when cofired therewith at sintering temperatures of about 900.degree. C.

대표청구항 ▼

[ What is claimed is:] [1.] A binary piezoelectric ceramic composition consisting of a main composition which is characterized by 95.0 to 99.5 weight percent of a system represented by a general formula: EQU Pb(Zr.sub.x Ti.sub.1-x)O.sub.3 +yMno.sub.2 which 0.ltoreq.x.ltoreq.1.0 and 0.1.ltoreq.y.ltor

[ What is claimed is:] [1.] A binary piezoelectric ceramic composition consisting of a main composition which is characterized by 95.0 to 99.5 weight percent of a system represented by a general formula: EQU Pb(Zr.sub.x Ti.sub.1-x)O.sub.3 +yMno.sub.2 which 0.ltoreq.x.ltoreq.1.0 and 0.1.ltoreq.y.ltoreq.1.0 wt. %;and 0.5 to 5.0 weight percent of an additive represented by a general formula: EQU wB.sub.2 O.sub.3 -xBi.sub.2 O.sub.3 -yMeO-zCuO rein w,x,y, and z are weight percentages of the respective components and w+x+y+z=1 and w is non-zero and wherein two of x, y, and z are non-zero;wherein Me is one of the metals selected from a group consisting of Ca, Sr, Ba, Zn, andwherein 0.01.ltoreq.w.ltoreq.0.15, 0.ltoreq.x.ltoreq.0.80, 0.ltoreq.y.ltoreq.y.ltoreq.0.60 and 0.ltoreq.z.ltoreq.0.55; wherein the piezoelectric ceramic composition is nonreactive with a silver electrode layer when cofired therewith at sintering temperatures of about 900.degree. C.