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ErAg 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 Ag atoms. All Er–Ag bond lengths are 3.13 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Er atoms.
Ag2Er is Titanium Disilicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er is bonded in a distorted q6 geometry to ten equivalent Ag atoms. There are two shorter (3.05 Å) and eight longer (3.06 Å) Er–Ag bond lengths. Ag is bonded in a 10-coordinate geometry to five equivalent Er atoms.
Ag3Er is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Er is bonded to twelve equivalent Ag atoms to form ErAg12 cuboctahedra that share corners with six equivalent ErAg12 cuboctahedra, corners with twelve equivalent AgEr4Ag8 cuboctahedra, edges with eighteen equivalent AgEr4Ag8 cuboctahedra, faces with eight equivalent ErAg12 cuboctahedra, and faces with twelve equivalent AgEr4Ag8 cuboctahedra. All Er–Ag bond lengths are 3.10 Å. Ag is bonded to four equivalent Er and eight equivalent Ag atoms to form distorted AgEr4Ag8 cuboctahedra that share corners with four equivalent ErAg12 cuboctahedra, corners with fourteen equivalent AgEr4Ag8 cuboctahedra, edges with six equivalent ErAg12 cuboctahedra, edges with twelve equivalent AgEr4Ag8 cuboctahedra, faces with four equivalent ErAg12 cuboctahedra, and faces with sixteen equivalent AgEr4Ag8 cuboctahedra. There are a spread of Ag–Ag bond distances ranging from 2.99–3.20 Å.