S. A. Kurnosenko, A. A. Burov, O. I. Silyukov, V. V. Voytovich, I. A. Zvereva
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引用次数: 0
Abstract
Synthesis of layered perovskite-like niobates APb2Nb3O10 (A = Rb, Cs), being promising visible light active photocatalysts, has been conducted by the ceramic method under variable conditions to obtain the samples with the highest possible phase purity. The oxides prepared were shown practically not to undergo protonation and hydration of the interlayer space upon keeping in water. Both phases APb2Nb3O10 were used to yield corresponding protonated hydrated forms HxA1 − xPb2Nb3O10∙yH2O via acid treatment. It was found that the propensity of the samples to the substitution of interlayer cations by protons depends clearly on the A+ cation: while the Rb-containing niobate is capable of complete protonation (x = 1) upon a single treatment with 6 M nitric acid, the Cs-containing counterpart gives a high enough protonation degree (x ≥ 0.9) only after several renewals of the acid solution. The protonated niobates obtained were exposed to an additional water treatment under hydrothermal conditions, which allowed producing new hydrated derivatives with the enhanced thermal stability towards interlayer dehydration as compared with the protonated precursors.
期刊介绍:
Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.