Figure 7
The phase diagram of the ground state of Co3+ as a function of Co-O bond lengths. The magenta circles are the Co-O bond lengths of Sr2Co0.5Ir0.5O4 estimated from ref. 28 and the blue line refers to an increase of its Co-O distance with temperature by keeping the ratio of Co-Oapex/Co-Oin-plane at room temperature. The green circle is those of one of two Co3+ sites in the O-phase in TlSr2CoO5 43. The green line represents the Co-O distances of LaCoO3 39 with pressure.
