Sr3Sn5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one Sn(1), four equivalent Sn(2), and four equivalent Sn(3) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), four equivalent Sn(2), and four equivalent Sn(3) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Sr(1), four equivalent Sr(2), two equivalent Sn(2), and two equivalent Sn(3) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Sn(1), and two equivalent Sn(3) atoms. In the third Sn site, Sn(3) is bonded in a 10-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Sn(1), one Sn(3), and two equivalent Sn(2) atoms.
Sr3Sn5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one Sn(1), four equivalent Sn(2), and four equivalent Sn(3) atoms. The Sr(1)-Sn(1) bond length is 3.44 Å. There are two shorter (3.47 Å) and two longer (3.76 Å) Sr(1)-Sn(2) bond lengths. There are two shorter (3.34 Å) and two longer (3.63 Å) Sr(1)-Sn(3) bond lengths. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), four equivalent Sn(2), and four equivalent Sn(3) atoms. Both Sr(2)-Sn(1) bond lengths are 3.52 Å. There are two shorter (3.45 Å) and two longer (3.71 Å) Sr(2)-Sn(2) bond lengths. There are two shorter (3.52 Å) and two longer (3.62 Å) Sr(2)-Sn(3) bond lengths. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Sr(1), four equivalent Sr(2), two equivalent Sn(2), and two equivalent Sn(3) atoms. Both Sn(1)-Sn(2) bond lengths are 3.00 Å. Both Sn(1)-Sn(3) bond lengths are 3.15 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Sn(1), and two equivalent Sn(3) atoms. Both Sn(2)-Sn(3) bond lengths are 3.02 Å. In the third Sn site, Sn(3) is bonded in a 10-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), one Sn(1), one Sn(3), and two equivalent Sn(2) atoms. The Sn(3)-Sn(3) bond length is 3.48 Å.