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Adequate amounts of the precursor of the cation at B-site were dissolved under vigorous stirring in a solution of citric acid (99.5 Riedel-de Hae¡§n) with an
excess of ethylene glycol (99.5 Riedel-de Hae¡§n) as the organic polydentate ligand. The citric acid/B-cation molar ratio was 4, while it was 1.38 for ethylene glycol/citric acid. The mixture was kept at 50¨C60 C with mild continuous stirring until a clear
solution was obtained.
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