Dion-Jacobson and related phases

If the pair of atoms at the boundaries of the perovskite-like sheets in the Ruddlesden-Popper phases are replaced with just one A atom, the series takes the formula AXA jB Oj j), and the materials are called Dion-Jacobson phases (Table 4.4). The perovskite slabs are cut parallel to the [100] planes of an ideal perovskite parent and have a composition (A As with the 

Ruddlesden-Popper structures, large numbers of cation combinations can give rise to phases of this type. Frequently the A and A ions are in a (+1/+3) pairing, combined with in oxides with n=2, for example, KLaNbjO, or a (+1/+2) pairing combined with in oxides with n=3, for example, RbCa2Ta30jg. 

As with the Ruddlesden-Popper phases, non-stoichiometry is common for phases containing Co, Mn or Fe as the B-site cation. 

---