Piezoelectric properties of the Pb(Sc1/2Nb1/2) O3-Pb(Mg1/3Nb2/3) O3-PbTiO3 ternary ceramic materials near the morphotropic phase boundary

The physical and electrical properties of xPb(Sc1/2Nb1/2)O3-yPb(Mg1/3Nb2/3)O3-zPbTiO3(PSMNT 100x/100y/100z) ternary ceramic materials near the morphotropic phase boundary (MPB) were investigated. The MPB follows on almost linear region between the PSMNT 58/00/42 and PSMNT 00/68/32 MPB compositions of the binary systems. The maximum piezoelectric constant, d 33 = 680 pC/N, were found at PSMNT 29/33/38, where εT 33/ε0 = 3,800, and electromechanical coupling factors, (k p = 70%, k31 = 43%, and k 33 = 76%) and T c = 207°C were obtained. The maximum electromechanical coupling factors, (k p = 72%, k 31 = 45%, and k 33 = 77%) were found at PSMNT 29/34/37, where εT 33/ε0 = 3,000, d 33 = 640 pC/N, and T c = 205°C were obtained. These values are better than those of PZT.