Perovskite-related structures, oxide

Fig. 16.2 Idealized structures of some perovskite-related layered oxides and their fluoride relatives.2)...

Low-Dimensional Oxides, Materials with 2H-Perovskite Related Structures... 

Lamellar perovskites of the general formula MI(A 1B 03 +i) are also known and have been tried as catalysts for reactions such as oxidative coupling of methane. [Barrault et al. (1992)]. One example of this type is CsCa2Nb3Oi0 which consists of blocks built up from three perovskite layers interleaved with Cs+ cations. Other perovskite-related structures have been discussed by Baran (1990). 

Ulla and Lombardo have focused their attention on catalysis with mixed oxides usually having perovskite or perovskite-related structures, but other structures are also considered. Information on the preparation, characterization, and redox reactions of these oxides are considered. Attention is then given to many physico-chemical applications of these materials. 

Several oxides with perovskite related structures can also be intercalated with oxygen ions by an electrochemical method. The oxide Sr2Fe20s with the brownmillerite structure has been electrochemically oxidized to SrFeOa. The reaction was carried out by controlled potential electrolysis at a potential below that for oxygen evolution in 1 M aqueous KOH at room temperature. Bulk oxidation was confirmed by Mossbauer spectroscopy and X-ray diffraction. Similar results have been obtained for electrochemical oxidation... 

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