Sodium potassium tantalate niobate -base piezoelectric ceramic and process for preparing same

The invention discloses a sodium potassium base tantalite-niobate piezo-electric ceramics,which comprises the following parts: potash, sodium carbonate, niobate oxide and tantalum oxide and one or more of 0.2-0.8 mol% Cu2+, Sb5+, Sn4+, Li+ in the base material, wherein the base material chemical gauge is (K1-xNax)(Nb1-yTay)O3 (x=0.1-0.9,y=0.01-0.30).The preparing method of sodium potassium base tantalite-niobate piezo-electric ceramics comprises the following steps: loading raw material in the balling tank to synthesize at 800-900 deg.c; insulating for 4-10 h; pressing clinker into disk biscuit under 50-100MPa isostatic cool pressing; overlapping and sintering into ceramics at 1000-1200 deg.c for 2-4h; burning silver electrode; polarizing.