Piezoelectric single crystal, ultrasonic probe, and array-type ultrasonic probe

摘要

Disclosed is a piezoelectric single crystal which has a large electromechanical coupling coefficient and hardly brings about depolarization due to the effect of heat in, e.g., the steps of manufacturing an ultrasonic transmitting/receiving element. The piezoelectric single crystal consists essentially of a general formula:PPPb{[M1.sub.1/3 Nb.sub.(2/3)-(2z/3) Ta.sub.2z/3 ] .sub.1-x-y Ti.sub.x M2.sub.y }O.sup. 3PPwherein M1 represents at least one metal selected from the group consisting of Zn, Ni, and Mg, M2 represents at least one metal selected from the group consisting of Pt, Fe, Bi, Rh, and Ir, and x, y, and z are defined as 0.05. ltoreq.x≦0.2, 0.00001≦y≦0.01, and 0≦z≦ 0.1, respectively.