(1-x)PMN-xPT Ceramics Prepared by Conventional and Modified Columbite Route: Effect on Electrical Properties

Abstract

This study aims to demonstrate how the chemical homogeneity of B cations affects the microstructure and electrical responses of (1-x)PMN-xPT ceramics. Two methodologies were employed to synthesize three different compositions, with x assuming the values 0.10, 0.28, and 0.35. If compared to conventional method, the Ti-modified columbite route, which is characterized by higher B cation homogeneity, leads to PMN-PT powders and ceramics with lower content of PNT pyrochlore phase and, for 0.65PMN-0.35PT composition, minor amount of tetragonal phase is found. Conclusively, PMN-PT ceramics obtained by modified route favors B cations homogeneity, enhancing the dielectric, ferroelectric and piezoelectric properties.

Preparation and Characterization of Relaxor Ferroelectric 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 by a Polymerizable Complex Method

“…For the PMN–PT ceramics sintered at 1250°C, the piezoelectric coefficient ( d 33 ) was measured after polarized at 30 kV/cm for 15 min. The d 33 is 360 pC/N, which is comparable with 348 pC/N of the PMN–PT ceramics prepared by the columbite route 32 …”