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Structural Characterization of Bismuth Layered Perovskite Treated with Acids

Structural characterization of the lanthanum-substituted bismuth layered perovskites, Sr1-3x/2LaxBi2Ta2O9 (SLBT, 3x = 0.2, 0.4, 0.6) was carried out by a technique combined the chemical analysis and selective dissolution of bismuth oxide interlayer. The bismuth layered perovskites were treated with 3 M HCl for 3 days. The chemical analysis for the acid-treated samples was made by fluorescent X-ray analysis. The chemical analysis combined with the selection dissolution clearly showed that lanthanum ions were preferentially introduced into A-sites of the perovskite-blocks. The A-site occupancy of lanthanum ions increased with increasing the calcination temperature of the samples.