Sr2CaSn5 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent Sn(3), four equivalent Sn(1), and four equivalent Sn(2) atoms. Ca(1) is bonded in a 9-coordinate geometry to one Sn(3), four equivalent Sn(1), and four equivalent Sn(2) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to four equivalent Sr(1), two equivalent Ca(1), one Sn(1), one Sn(3), and two equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Ca(1), one Sn(3), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one Ca(1), two equivalent Sn(1), and two equivalent Sn(2) atoms.
Sr2CaSn5 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent Sn(3), four equivalent Sn(1), and four equivalent Sn(2) atoms. Both Sr(1)-Sn(3) bond lengths are 3.46 Å. There are two shorter (3.50 Å) and two longer (3.57 Å) Sr(1)-Sn(1) bond lengths. There are two shorter (3.41 Å) and two longer (3.65 Å) Sr(1)-Sn(2) bond lengths. Ca(1) is bonded in a 9-coordinate geometry to one Sn(3), four equivalent Sn(1), and four equivalent Sn(2) atoms. The Ca(1)-Sn(3) bond length is 3.34 Å. There are two shorter (3.24 Å) and two longer (3.58 Å) Ca(1)-Sn(1) bond lengths. There are two shorter (3.41 Å) and two longer (3.75 Å) Ca(1)-Sn(2) bond lengths. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to four equivalent Sr(1), two equivalent Ca(1), one Sn(1), one Sn(3), and two equivalent Sn(2) atoms. The Sn(1)-Sn(1) bond length is 3.32 Å. The Sn(1)-Sn(3) bond length is 3.20 Å. Both Sn(1)-Sn(2) bond lengths are 3.03 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Ca(1), one Sn(3), and two equivalent Sn(1) atoms. The Sn(2)-Sn(3) bond length is 3.00 Å. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one Ca(1), two equivalent Sn(1), and two equivalent Sn(2) atoms.