Abstract
La1 − x Ba x FeO3 − δ (x = 0–1) perovskites were prepared by the mechanical activation of mixtures of binary oxides in a centrifugal planetary ball mill for 3 min followed by calcination at 1100°C for 4 h, and their phase composition was determined by X-ray diffraction. All samples up to x = 0.8 are single-phase oxides with a perovskite structure. The x = 1 sample is a mixture of perovskite-and brownmillerite-type phases. An orthorhombic-to-cubic morphotropic transition is observed at x = 0.3. The catalytic activity of the perovskite samples in CO oxidation, chosen as a model reaction, depends nonmonotonically on the barium content of the catalyst. High catalytic activities are shown by the x = 0.8 and 0.3 samples.
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Original Russian Text © L.A. Isupova, A.N. Nadeev, I.S. Yakovleva, S.V. Tsybulya, 2008, published in Kinetika i Kataliz, 2008, Vol. 49, No. 1, pp. 142–146.
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Isupova, L.A., Nadeev, A.N., Yakovleva, I.S. et al. Mechanochemical synthesis and physicochemical properties of La1 − x Ba x FeO3 − δ (0 ≤ x ≤ 1) perovskites. Kinet Catal 49, 133–137 (2008). https://doi.org/10.1134/S0023158408010175
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DOI: https://doi.org/10.1134/S0023158408010175