Abstract: A piezoelectric ceramic composition firable at a reduced sintering temperature is provided. The main composition is expressed with the general formula: [(Pb1-m-n-pSrmBanCdp)(ZrxTi1-x)1-k(BiaMnb)k]O3+yBi2O3+z(Fluorine Compound) where 0.00?m<0.15, 0.00?n<0.15, 0.00<(m+n)<0.21, 0.00 <p<0.04, 0.50?x?0.56, 0.00<a?1.00, 0.00<b?1.00, 0.00<k<0.04, 0.00?y?1.00(in weight %), 0.00?z?1.00(in weight %) and fluorine compound is LiF or MgF2. The ceramic material of the invention can be advantageously used in multilayered piezoelectric ceramic devices, in piezoelectric ceramic transformers, in piezoelectric ceramic actuators or in piezoelectric ceramic transducers.

Abstract: The soft piezoelectric ceramic composition is a soft piezoelectric ceramic composition sinterable at a reduced temperature with high piezoelectric parameters and is used in a piezoelectric device. Preferably the soft piezoelectric ceramic composition comprises: [(Pb1-m-nSrmBan)(1-y)Biy[](ZrxTi1-x)1-a-bNiaWb]O3+pCdO wherein m,n,x,y,a and b are molar ratio, p is wt % and are in ranges, repectively, 0.00≦m<0.18, 0.00≦n≦0.18,0.00≦(m+n)≦0.21,0.40≦x≦0.60 0.00<y<0.04, 0.00≦a≦0.02, 0.00<b≦0.02, 0.00<p≦2.00. The soft piezoelectric ceramic composition has high piezoelectric constants and electromechanical coupling coefficients and can be sintered at a reduced temperature below 1000° C. Further, the soft piezoelectric ceramic materials can be co-fired with pure Ag electrode below 960° C.