Er2Fe4Si9 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Er is bonded in a 6-coordinate geometry to three equivalent Fe and eight Si atoms. All Er–Fe bond lengths
V5NiO23 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one V5NiO23 cluster. there are five inequivalent V sites. In the first V site, V is bonded in a
