Refined Position of the Morphotropic Phase Boundary and Compositional Search of Pb(Mg_(1/3)Nb_(2/3))O_3-PbZrO_3-PbTiO_3 Ceramics for Piezoelectric Applications

摘要

The morphotropic phase boundary (MPB) for the PMNZT series of high-density ceramics (xPb (Mg_(1/3) Nb_(2/3)) O_3-yPbZrO_3-zPbTiO_3;x=0.1-0.2,y=0.400-0.486,z=0.395-0.477) is relocated based on analyses of the dielectric,piezoelectric and ferroelectric properties of incremental compositions.The PMNZT ceramics,fabricated by the columbite route,exhibit a single-phase perovskite structure.The refined MPB line is shifted toward the PbTiO_3 (PT) side in the ternary field by approximately 2.4 mol% from the position reported in the literature and the pinpoint composition for piezoelectric applications is further shifted toward the PT side by approximately 1.2 mol% from the obtained MPB line.The PMNZT 14.2/41.6/44.2 (100x/100y/100z) composition near the MPB line is shown to have properties suitable for practical applications.