Sr11Al4Sn3 crystallizes in the cubic Fm-3m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to three equivalent Al(1) and three equivalent Sn(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to one Sr(3), two equivalent Al(1), and two equivalent Sn(1) atoms. In the third Sr site, Sr(3) is bonded in a cuboctahedral geometry to twelve equivalent Sr(2) atoms. In the fourth Sr site, Sr(4) is bonded in a distorted octahedral geometry to six equivalent Sn(1) atoms. Al(1) is bonded in a 9-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Al(1) atoms. Sn(1) is bonded in a 9-coordinate geometry to one Sr(4), four equivalent Sr(1), and four equivalent Sr(2) atoms.
Sr11Al4Sn3 crystallizes in the cubic Fm-3m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to three equivalent Al(1) and three equivalent Sn(1) atoms. All Sr(1)-Al(1) bond lengths are 3.47 Å. All Sr(1)-Sn(1) bond lengths are 3.54 Å. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to one Sr(3), two equivalent Al(1), and two equivalent Sn(1) atoms. The Sr(2)-Sr(3) bond length is 4.13 Å. Both Sr(2)-Al(1) bond lengths are 3.46 Å. Both Sr(2)-Sn(1) bond lengths are 3.54 Å. In the third Sr site, Sr(3) is bonded in a cuboctahedral geometry to twelve equivalent Sr(2) atoms. In the fourth Sr site, Sr(4) is bonded in a distorted octahedral geometry to six equivalent Sn(1) atoms. All Sr(4)-Sn(1) bond lengths are 3.79 Å. Al(1) is bonded in a 9-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Al(1) atoms. All Al(1)-Al(1) bond lengths are 2.73 Å. Sn(1) is bonded in a 9-coordinate geometry to one Sr(4), four equivalent Sr(1), and four equivalent Sr(2) atoms.