Ruddlesden-Popper series

The photocatalytic cleavage of water in the Dion-Jacobson series is presented first followed by studies on Ruddlesden-Popper series and finally on the intermediate series. Table 16.3 lists the oxides employed for photocatalysis studies. 

K2La2Ti3Oio is a typical oxide in the Ruddlesden-Popper series exhibiting interlayer reactivity44) It forms a hydrate with about 1-2 H20 molecules per formula unit under ambient conditions.44,74) Fig. 16.9 shows schematic structures of anhydrous and hydrated oxides. Variation of the number of waters of hydration with humidity and exposure time has been reported for the analogous compound K2Nd2Ti3O10.70) A band gap of 3.5 eV has been estimated for K2La2Ti3Oi0 from reflectance measurements.102)... 

K.S. (2000) Perovskite-like crystak of the Ruddlesden-Popper series. Crystallogr. Rep., 45 (5), 792-798. 

Concerning the Ruddlesden-Popper series, Laberty et alP reported on the performance of SOFC cathodes with lanthanum-nickelate-based composites. They showed that lanthanum nickelate performs poorly when used as a single-phase cathode in yttria-stabilised, zirconia-based air-H2 button cells at 800 °C. However high power densities of up to 2.2 W cm were measured using a La2Ni04+ -CS0 composite bilayer cathode. 

The second member of the Ruddlesden-Popper series of phases is typified by Sr3Ti207 (Ruddlesden and Popper, 1958). This structure consists of double layers... 

Eu4Ti30,o appears to be the only documented rare earth oxide phase likely to have n = 3 in the Ruddlesden-Popper series (McCarthy et al., 1969). In accord with the above structures it consists simply of triple perovskite layers translated with respect to each other as before. 

Fig. 13 Total conductivity of the nickelate phases where n = 1, 2, 3 in the Ruddlesden-Popper series, highlighting the increased conductivity as n increases. [43]...

S. Takahashi, S. Nishimoto, M. Matsuda, M. Miyake, Electrode properties of the Ruddlesden-Popper series Lun+iNinOsn+j (n = 1,2 and 3), as intermediate temperature solid oxide fuel cells. J. Am. Ceram. Soc. 93, 2329-2333 (2010)... 

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