Abstract
Sr x Ba 1− x Nb 2O 6 ( x=0.4, 0.5, 0.6) ceramic powders have been synthesized by using the aqueous organic gel routes. The desired metal cations are chelated in a solution using citric acid and ethylenediaminetertraacetic acid (EDTA) as the chelating agents. The thermal decompostion of the metal carboxylate precursors gels have been studied by TG/DTA and the products derived from calcinations of the gels at different temperatures have been characterized by XRD and TEM. The results reveal that tetragonal tungsten–bronze-type SBN with fine particle size could be achieved at 800 °C. The pH 8 used during the preparation of Sr–Ba–Nb precursor gels is determined by calculation of the conditional formation constants K cf of Sr–EDTA and Ba–EDTA complexes. The influences of the pH and the molar ratio of citric acid:Nb cation on the formation of homogeneous Sr–Ba–Nb precursor gels are also studied.
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