| 摘要 |
A piezoelectric material with a high fracture toughness and a large electromechanical coupling coefficient is disclosed. This piezoelectric material contains a composition which is represented by xPb(Sc1/2Nb1/2)O3-yPbTiO3-zPbZrO3-wPb(Me1/3Nb2/3)O3, where Me is at least one metal selected from the group consisting of Mg, Zn and Ni, and x+y+z+w=1.00, x, y, z, and w being values falling within region which is defined by connecting points a, b, c, and d and which excludes a line ab, the points a, b, c, and d existing on the faces of a regular trigonal pyramid having apices P1, P2, P3, and P4 which correspond to Pb(Sc1/2Nb1/2)O3, PbTiO3, PbZrO3 and Pb(Me1/3Nb2/3)O3, respectively, and the points a, b, c, and d having the following coordinate values when the apices P1, P2, P3, and P4 have coordinate values of (X1, Y1, Z1, W1=1, 0, 0, 0), (X2, Y2, Z2, W2=0, 1, 0, 0, 0), (X3, Y3, Z3, W3=0, 0, 1, 0), and (X4, Y4, Z4, W4=0, 0, 0, 1): -X Y Z W -a 0.72 0.28 0.00 0.00 -b 0.02 0.98 0.00 0.00 -c 0.02 0.28 0.70 0.00 -d 0.02 0.20 0.00 0.78 - |
