New preparation method of low-temperature-sinterable perovskite 0.9Pb(Mg1/3Nb2/3)O-3-0.1PbTiO(3) powder and its dielectric properties

Abstract

A relaxer ferroelectric material, 0.9Pb(Mg1/3Nb2/3)O-3-0.1PbTiO(3) (0.9PMN-0.1PT) with a pyrochlore-free phase, was prepared by using one-step calcination in the present study. The 0.9PMN-0.1PT powder with the pure perovskite phase was prepared successfully from a mixture of the PMN precursor and the crystalline PT by heating for 2 h at temperatures greater than or equal to 750 degrees C. The PMN precursor was synthesized by adding an aqueous Mg(NO3)(2) solution, rather than MgO, to the alcoholic slurry of PbO and Nb2O5. The 0.9PMN-0.1PT powder sintered to >96% relative density via heat treatment for 2 h at temperatures of 900 degrees-1200 degrees C. The highest room-temperature dielectric constant (epsilon(rt)) was 24700 at 1 kHz for the samples that were sintered at 1100 degrees C; however, the samples that were sintered at 900 degrees C still had epsilon(rt) values of 22600 at 1 kHz.