Figure 1

Crystal structures of Sr5(PO4)3Cl (a) and Sr5(BO3)3Cl (b) viewed from the z-direction and the coordination of the Sr/P and B/Sr sites in the end members, respectively.
Crystal structures of Sr5(PO4)3Cl (a) and Sr5(BO3)3Cl (b) viewed from the z-direction and the coordination of the Sr/P and B/Sr sites in the end members, respectively.