Patent ID: 7591543

Claim:
A piezoelectric member of single crystal or uniaxial crystal, wherein said piezoelectric member has a perovskite type oxide of a general formula ABO 3 with a main component of the A site being Pb and a main component of the B site containing at least three kinds of elements selected from the group consisting of Mg, Zn, Sc, In, Yb, Ni, Nb, Ti, and Ta, and 10>(ε MAX −ε RT )/( t MAX −25)>0.1, where ε RT is a relative dielectric constant of said piezoelectric member at 25° C. and 1 kHz, ε MAX is the maximum value of the relative dielectric constant at not more than 200° C. and 1 kHz, and t MAX is a temperature indicative of the maximum value of the relative dielectric constant.