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Lamellar perovskites

The most often found types of mixed oxides are perovskites (RBO3), K2NiF4-type oxides (R2BO4), R 1 B C>2 +1 ( = 2 or 3), lamellar perovskites, pyrochlores, spinels, and oxide solid solutions. Perovskite oxides are, by far, the most commonly used oxides. Therefore, this chapter will reflect this situation by putting more emphasis on this type of materials. Within this section the structure, preparation methods and general characteristics of the mixed oxides will be discussed. Note that R stands for rare-earth elements while A includes all types of elements. [Pg.76]

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). [Pg.77]

The structures of ternary oxides such as spinels, perovskites, pyrochlores, layered cuprates (high-7 c superconductors), and other lamellar oxides are fascinating subjects by themselves and are beyond the scope of the present discussion. [Pg.44]

Ebina Y, Sakai N, Sasaki T (2005) Photocatalyst of Lamellar Aggregates of RuOx Loaded Perovskite Nanosheets for Overall] Phys Chem B 109 17212-17216... [Pg.418]

Hexaaluminates represent a class of materials that are highly resistant to sintering at high temperature. Therefore, these materials have attracted the attention of researchers who are involved in developing catalysts for high temperature applications. Hexaaluminates have been used as supports as well as the active material in catalytic combustion reactions [121-142]. Hexaaluminates can be represented by the formula AAI12O19 where A is an alkaline or alkaline-earth metal. They consist of a lamellar structure and both A cation and A1 can be partly substituted by other cations. Incorporation of other cations drastically modify the catalytic activity of these materials. However, such modifications are rather limited compared to the possibilities existing in perovskite type oxides. [Pg.553]


See other pages where Lamellar perovskites is mentioned: [Pg.172]    [Pg.676]    [Pg.193]    [Pg.172]    [Pg.676]    [Pg.193]    [Pg.139]    [Pg.1796]    [Pg.82]    [Pg.532]    [Pg.153]    [Pg.172]    [Pg.14]   
See also in sourсe #XX -- [ Pg.676 ]




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Lamellarity

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