Sm3In5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one In(3), four equivalent In(1), and four equivalent In(2) atoms. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to two equivalent In(3), four equivalent In(1), and four equivalent In(2) atoms. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), two equivalent In(2), and two equivalent In(3) atoms. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one In(2), one In(3), and two equivalent In(1) atoms. In the third In site, In(3) is bonded in a 5-coordinate geometry to one Sm(1), four equivalent Sm(2), two equivalent In(2), and four equivalent In(1) atoms.
Sm3In5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one In(3), four equivalent In(1), and four equivalent In(2) atoms. The Sm(1)-In(3) bond length is 3.13 Å. There are two shorter (3.17 Å) and two longer (3.50 Å) Sm(1)-In(1) bond lengths. There are two shorter (3.16 Å) and two longer (3.37 Å) Sm(1)-In(2) bond lengths. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to two equivalent In(3), four equivalent In(1), and four equivalent In(2) atoms. Both Sm(2)-In(3) bond lengths are 3.31 Å. There are two shorter (3.23 Å) and two longer (3.55 Å) Sm(2)-In(1) bond lengths. There are two shorter (3.30 Å) and two longer (3.41 Å) Sm(2)-In(2) bond lengths. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), two equivalent In(2), and two equivalent In(3) atoms. Both In(1)-In(2) bond lengths are 3.01 Å. There is one shorter (3.14 Å) and one longer (3.40 Å) In(1)-In(3) bond length. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one In(2), one In(3), and two equivalent In(1) atoms. The In(2)-In(2) bond length is 3.27 Å. The In(2)-In(3) bond length is 3.23 Å. In the third In site, In(3) is bonded in a 5-coordinate geometry to one Sm(1), four equivalent Sm(2), two equivalent In(2), and four equivalent In(1) atoms.