Sr11Sb10 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one Sb(1), one Sb(2), one Sb(4), and four equivalent Sb(5) atoms to form a mixture of distorted face, corner, and edge-sharing SrSb7 pentagonal bipyramids. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Sb(3), two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(5) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to four equivalent Sb(3) and four equivalent Sb(5) atoms. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one Sb(4), two equivalent Sb(1), two equivalent Sb(3), and two equivalent Sb(5) atoms. There are five inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and four equivalent Sr(4) atoms. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Sr(2) atoms. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one Sr(2), two equivalent Sr(3), four equivalent Sr(4), and two equivalent Sb(3) atoms. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Sr(4) atoms. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(4), four equivalent Sr(1), and one Sb(5) atom.
Sr11Sb10 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one Sb(1), one Sb(2), one Sb(4), and four equivalent Sb(5) atoms to form a mixture of distorted face, corner, and edge-sharing SrSb7 pentagonal bipyramids. The Sr(1)-Sb(1) bond length is 3.74 Å. The Sr(1)-Sb(2) bond length is 3.39 Å. The Sr(1)-Sb(4) bond length is 3.33 Å. There are two shorter (3.61 Å) and two longer (3.69 Å) Sr(1)-Sb(5) bond lengths. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Sb(3), two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(5) atoms. The Sr(2)-Sb(3) bond length is 3.73 Å. Both Sr(2)-Sb(1) bond lengths are 3.15 Å. Both Sr(2)-Sb(2) bond lengths are 3.76 Å. Both Sr(2)-Sb(5) bond lengths are 3.95 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to four equivalent Sb(3) and four equivalent Sb(5) atoms. All Sr(3)-Sb(3) bond lengths are 3.59 Å. All Sr(3)-Sb(5) bond lengths are 3.75 Å. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one Sb(4), two equivalent Sb(1), two equivalent Sb(3), and two equivalent Sb(5) atoms. The Sr(4)-Sb(4) bond length is 3.39 Å. Both Sr(4)-Sb(1) bond lengths are 3.38 Å. Both Sr(4)-Sb(3) bond lengths are 3.64 Å. Both Sr(4)-Sb(5) bond lengths are 3.36 Å. There are five inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and four equivalent Sr(4) atoms. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Sr(2) atoms. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one Sr(2), two equivalent Sr(3), four equivalent Sr(4), and two equivalent Sb(3) atoms. Both Sb(3)-Sb(3) bond lengths are 3.05 Å. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Sr(4) atoms. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(4), four equivalent Sr(1), and one Sb(5) atom. The Sb(5)-Sb(5) bond length is 2.98 Å.