ErTe2 crystallizes in the tetragonal P4/nmm space group. Er(1) is bonded in a 9-coordinate geometry to four equivalent Te(2) and five equivalent Te(1) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to five equivalent Er(1) atoms to form a mixture of distorted corner and edge-sharing TeEr5 trigonal bipyramids. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Te(2) atoms.
ErTe2 crystallizes in the tetragonal P4/nmm space group. Er(1) is bonded in a 9-coordinate geometry to four equivalent Te(2) and five equivalent Te(1) atoms. All Er(1)-Te(2) bond lengths are 3.26 Å. There is one shorter (3.15 Å) and four longer (3.26 Å) Er(1)-Te(1) bond lengths. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to five equivalent Er(1) atoms to form a mixture of distorted corner and edge-sharing TeEr5 trigonal bipyramids. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Te(2) atoms. All Te(2)-Te(2) bond lengths are 3.13 Å.