Patent ID: 7547401

Claim:
A piezoelectric ceramic composition made by combining Pb, Sr, Ba, Mg, Nb, Zr, and Ti, precursor materials according to the base formula: Pb (1-z) M z (Mg 1/3 Nb 2/3 ) x (Zr y Ti 1-y ) 1-x O 3 wherein M is selected to be either Sr or Ba, x is between about 0.35 and about 0.40, y is between about 0.36 and about 0.42, and z is between about 0.04 and about 0.08; wherein said composition additionally includes a MnO 2 dopant in an amount between 0.2 wt% and 0.4 wt%. and further wherein said composition additionally comprises between about 0.01 and 2.0 wt % Nb 2 O 5 as a dopant.