Preparation and piezoelectric properties of Pb(Sc/sub 1/2/Nb/sub 1/2/)/sub 3/-Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ solid solution ceramics

Abstract

Electrical properties and crystal structures of the system Pb(Sc/sub 1/2/Nb/sub 1/2/)O/sub 3/Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ are described. In this ternary system, the perovskite phase exists in the composition range of less 50 mol% of Pb(Sc/sub 1/2/Nb/sub 1/2/)O/sub 3/. Addition of excess PbO to this system is effective for obtaining the perovskite structure. In the binary (1-x)Pb(Sc/sub 1/2/Nb/sub 1/2/)O/sub 3/xPb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/ system, the Curie temperature is decreasing with increase of x in the range of 0.3> x>O and it is increasing above x=0.3. Site preference in the perovskite structure must be considered for this nonlinear change of Tc.