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Er4Sb3 crystallizes in the cubic I-43d space group. The structure is three-dimensional. Er is bonded in a 6-coordinate geometry to six equivalent Sb atoms. There are three shorter (3.05 Å) and three longer (3.28 Å) Er–Sb bond lengths. Sb is bonded to eight equivalent Er atoms to form a mixture of distorted face, edge, and corner-sharing SbEr8 hexagonal bipyramids.
Er5Sb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Er sites. In the first Er site, Er is bonded in a 5-coordinate geometry to five equivalent Sb atoms. There are a spread of Er–Sb bond distances ranging from 3.03–3.37 Å. In the second Er site, Er is bonded in a 6-coordinate geometry to six equivalent Sb atoms. All Er–Sb bond lengths are 3.17 Å. Sb is bonded in a 9-coordinate geometry to nine Er atoms.
ErSb is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er3+ is bonded to six equivalent Sb3- atoms to form a mixture of edge and corner-sharing ErSb6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Er–Sb bond lengths are 3.08 Å. Sb3- is bonded to six equivalent Er3+ atoms to form a mixture of edge and corner-sharing SbEr6 octahedra. The corner-sharing octahedral tilt angles are 0°.
Er5Sb3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Er sites. In the first Er site, Er is bonded in a 6-coordinate geometry to six Sb atoms. There are a spread of Er–Sb bond distances ranging from 3.02–3.48 Å. In the second Er site, Er is bonded in a 5-coordinate geometry to five Sb atoms. There are a spread of Er–Sb bond distances ranging from 2.99–3.47 Å. In the third Er site, Er is bonded in a 5-coordinate geometry to five Sb atoms. There are a spread of Er–Sb bond distances ranging from 2.98–3.29 Å. In the fourth Er site, Er is bonded to five Sb atoms to form distorted edge-sharing ErSb5 square pyramids. There are a spread of Er–Sb bond distances ranging from 3.09–3.14 Å. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded in a 8-coordinate geometry to eight Er atoms. In the second Sb site, Sb is bonded in a 9-coordinate geometry to nine Er atoms.
ErSb is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Er3+ is bonded in a body-centered cubic geometry to eight equivalent Sb3- atoms. All Er–Sb bond lengths are 3.27 Å. Sb3- is bonded in a body-centered cubic geometry to eight equivalent Er3+ atoms.
ErSb2 is trigonal omega structured and crystallizes in the orthorhombic C222 space group. The structure is two-dimensional and consists of one ErSb2 sheet oriented in the (0, 0, 1) direction. Er3+ is bonded in a 4-coordinate geometry to four equivalent Sb+1.50- atoms. All Er–Sb bond lengths are 3.04 Å. Sb+1.50- is bonded in a 2-coordinate geometry to two equivalent Er3+ atoms.
ErSb3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Er3+ is bonded to twelve equivalent Sb1- atoms to form a mixture of corner and face-sharing ErSb12 cuboctahedra. There are six shorter (3.26 Å) and six longer (3.45 Å) Er–Sb bond lengths. Sb1- is bonded in a 4-coordinate geometry to four equivalent Er3+ atoms.