Powders of SrBi2Nb2O9 (SBN) were synthesized using an aqueous solution method from mixtures of all water-soluble compounds including Sr-EDTA, Bi-EDTA and Nb-citrate. Heating of a mixed aqueous solution with the molar ratio of Sr:Bi:Nb:citric acid=1:2:2:10 produced a pale-yellow gelatinous viscous matter without any precipitation, which was subsequently pyrolyzed at 300°C to give a powder precursor for SBN. The formation of a pure Perovskite ferroelectric SBN occurred when the powder precursor was heat-treated in air at temperatures higher than 650°C. A fluorite SBN formed in the 500-600°C range, which appeared to act as an intermediate phase prior to the formation of the Perovskite SBN. The environmentally beneficial aspect of the present aqueous solution route was briefly discussed.
ASJC Scopus subject areas
- Metals and Alloys