Sr11In3Al4 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 In(1) and three equivalent Al(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to one Sr(4), two equivalent In(1), and two equivalent Al(1) atoms. In the third Sr site, Sr(3) is bonded in a distorted octahedral geometry to six equivalent In(1) atoms. In the fourth Sr site, Sr(4) is bonded in a cuboctahedral geometry to twelve equivalent Sr(2) atoms. In(1) is bonded in a 9-coordinate geometry to one Sr(3), four equivalent Sr(1), and four equivalent Sr(2) 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.
Sr11In3Al4 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 In(1) and three equivalent Al(1) atoms. All Sr(1)-In(1) bond lengths are 3.60 Å. All Sr(1)-Al(1) bond lengths are 3.44 Å. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to one Sr(4), two equivalent In(1), and two equivalent Al(1) atoms. The Sr(2)-Sr(4) bond length is 4.17 Å. Both Sr(2)-In(1) bond lengths are 3.57 Å. Both Sr(2)-Al(1) bond lengths are 3.49 Å. In the third Sr site, Sr(3) is bonded in a distorted octahedral geometry to six equivalent In(1) atoms. All Sr(3)-In(1) bond lengths are 3.84 Å. In the fourth Sr site, Sr(4) is bonded in a cuboctahedral geometry to twelve equivalent Sr(2) atoms. In(1) is bonded in a 9-coordinate geometry to one Sr(3), four equivalent Sr(1), and four equivalent Sr(2) 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. All Al(1)-Al(1) bond lengths are 2.75 Å.