Effect of calcination conditions on phase formation and particle size of lead nickel niobate powders synthesized by using Ni_4Nb_2O_9 precursor

摘要

An approach to synthesize lead nickel niobate, Pb(Ni_(1/3)Nb_(2/3))O_3 or PNN, powders with a modified two-stage mixed oxide synthetic route has been developed. Novel intermediate phase of nickel diniobate (Ni_4Nb_2O_9) was employed as a B-site precursor, with the formation of the PNN phase investigated as a function of calcination conditions by TG-DTA and XRD techniques. Morphology, particle size and chemical composition have been determined via a combination of SEM and EDX techniques. It has been found that the unreacted PbO and Pb_(1.45)Nb_2O_(6.26) phases tend to form together with PNN, depending on calcination conditions. It is seen that optimization of calcination conditions can lead to a 100% yield of PNN in a cubic phase.