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ErTl is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Er is bonded in a distorted body-centered cubic geometry to eight equivalent Tl atoms. All Er–Tl bond lengths are 3.29 Å. Tl is bonded in a distorted body-centered cubic geometry to eight equivalent Er atoms.
ErTl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Er–Tl bond lengths are 3.27 Å. Tl is bonded in a body-centered cubic geometry to eight equivalent Er atoms.
ErTl3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Er is bonded to twelve equivalent Tl atoms to form ErTl12 cuboctahedra that share corners with twelve equivalent ErTl12 cuboctahedra, edges with twenty-four equivalent TlEr4Tl8 cuboctahedra, faces with six equivalent ErTl12 cuboctahedra, and faces with twelve equivalent TlEr4Tl8 cuboctahedra. All Er–Tl bond lengths are 3.37 Å. Tl is bonded to four equivalent Er and eight equivalent Tl atoms to form TlEr4Tl8 cuboctahedra that share corners with twelve equivalent TlEr4Tl8 cuboctahedra, edges with eight equivalent ErTl12 cuboctahedra, edges with sixteen equivalent TlEr4Tl8 cuboctahedra, faces with four equivalent ErTl12 cuboctahedra, and faces with fourteen equivalent TlEr4Tl8 cuboctahedra. All Tl–Tl bond lengths are 3.37 Å.
Er5Tl3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are three inequivalent Er sites. In the first Er site, Er is bonded in a 6-coordinate geometry to six Tl atoms. There are two shorter (3.19 Å) and four longer (3.20 Å) Er–Tl bond lengths. In the second Er site, Er is bonded in a 3-coordinate geometry to five Tl atoms. There are a spread of Er–Tl bond distances ranging from 3.12–3.66 Å. In the third Er site, Er is bonded in a 3-coordinate geometry to five Tl atoms. There are a spread of Er–Tl bond distances ranging from 3.11–3.66 Å. There are two inequivalent Tl sites. In the first Tl site, Tl is bonded in a 9-coordinate geometry to nine Er atoms. In the second Tl site, Tl is bonded in a 9-coordinate geometry to nine Er atoms.