Dion-Jacobson 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. 

FIGURE 14.9 Ideal tetragonal perovskite-like structures of the members of the (a) Rud-dlesden-Popper, (b) Aurivillius, and (c) Dion-Jacobson series. 

Uma, S., Raju, A.R., and Gopalakrishnan, J. (1993) Bridging the Ruddlesden-Popper and the Dion-Jacobson series of layered perovskites synthesis of layered oxides, A2- La2Ti3- Nb Oio (A=K, Rb), exhibiting ion exchange. /, Mater. Chem., 3(7), 709-713. 

If the pair of A atoms at the boundaries of the perovskite-like sheets in the Ruddleston-Popper phases are replaced with just one A atom, the series of phases takes the formula A (A iB 03 +i), where A and A are large ions, typically a (+1/+3) pairing, and B is a medium-sized transition-metal ion, typically Nb5+. These materials are called Dion-Jacobson phases. The majority of examples synthesized to date are of the n = 2 phase, typified by KLaNb207, CsBiNb207, and so on (Fig. 4.29). A few examples of the n = 3 phase are also known, including CsCa2Nb3Oio-... 

The Aurivillius phases again contain slabs of perovskite sliced along the ideal [100] direction. They are formed by replacement of the interlayer A structures in the Ruddlesden-Popper phases and A in the Dion-Jacobson phases with a layer of composition Bi O - This gives the series a general formula (Bip XA jB j, ), sometimes written in an ionic form (Bip ) (A jBPj j) " (Table 4.5). As before, the perovskite slabs have the formula (A where A is a large cation nom-... 

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