Figure 2 The crystal structures of (a) Sr3Ni2O5Cl2 and (b) Sr2NiO3Cl (Tsujimoto et al., 2013), and local coordination environments around (c) an Ni site and (d) Sr sites in the former compound and (e)/(f) those in the latter compound. The boxes in panels (a) and (b) represent unit cells. These figures were created with VESTA (Momma & Izumi, 2011).