Abstract
The influence of the morphotropic phase boundary (MPB) on the dielectric and piezoelectric properties of PbNi1/3Nb2/3O3-PbZrO3-PbTiO3 (PNN-PZ-PT) ternary system were systematically investigated. The results showed that the piezoelectric constant d31 and plane coupling factor kp reached a maximum in the vicinity of morphotropic phase boundary. The highest value of the piezoelectric constant d31 was 260×10−12 C/N. The Curie temperature Tc decreased rapidly with increasing content of PNN. The lattice parameters a increased and c decreased with increasing PNN content and the Zr/Zr + Ti ratio as a result of the crystal structural transformation from tetragonal to rhombohedral phases.
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