The morphotropic phase boundary MPB for the PMNZT series of high-density ceramics xPbMg 13 Nb 23 O 3 -yPbZrO 3 -zPbTiO 3 ; xࢼ0.1-0.2, yࢼ0.400-0.486, zࢼ0.395-0.477 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 molಚ 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 molಚ from the obtained MPB line. The PMNZT 14.241.644.2 100x100y100z composition near the MPB line is shown to have properties suitable for practical applications.
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