Sr5In3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent In(2) and three equivalent In(1) atoms to form a mixture of distorted corner, face, and edge-sharing SrIn5 trigonal bipyramids. In the second Sr site, Sr(2) is bonded in a square co-planar geometry to four equivalent In(1) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to two equivalent Sr(2), six equivalent Sr(1), and one In(1) atom. In the second In site, In(2) is bonded in a 8-coordinate geometry to eight equivalent Sr(1) atoms.
Sr5In3 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent In(2) and three equivalent In(1) atoms to form a mixture of distorted corner, face, and edge-sharing SrIn5 trigonal bipyramids. Both Sr(1)-In(2) bond lengths are 3.67 Å. All Sr(1)-In(1) bond lengths are 3.54 Å. In the second Sr site, Sr(2) is bonded in a square co-planar geometry to four equivalent In(1) atoms. All Sr(2)-In(1) bond lengths are 3.53 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to two equivalent Sr(2), six equivalent Sr(1), and one In(1) atom. The In(1)-In(1) bond length is 2.81 Å. In the second In site, In(2) is bonded in a 8-coordinate geometry to eight equivalent Sr(1) atoms.