Sm3(Pd10Si3)2 crystallizes in the cubic Fm-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to four equivalent Pd(1) and twelve equivalent Pd(2) atoms to form distorted SmPd16 tetrahedra that share edges with six equivalent Sm(1)Pd16 tetrahedra and faces with four equivalent Sm(2)Pd12 cuboctahedra. In the second Sm site, Sm(2) is bonded to twelve equivalent Pd(2) atoms to form distorted face-sharing SmPd12 cuboctahedra. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to one Sm(1) and three equivalent Si(1) atoms to form a mixture of edge and corner-sharing PdSmSi3 tetrahedra. In the second Pd site, Pd(2) is bonded in a 2-coordinate geometry to one Sm(2), two equivalent Sm(1), and two equivalent Si(1) atoms. Si(1) is bonded in a 8-coordinate geometry to four equivalent Pd(1) and four equivalent Pd(2) atoms.
Sm3(Pd10Si3)2 crystallizes in the cubic Fm-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to four equivalent Pd(1) and twelve equivalent Pd(2) atoms to form distorted SmPd16 tetrahedra that share edges with six equivalent Sm(1)Pd16 tetrahedra and faces with four equivalent Sm(2)Pd12 cuboctahedra. All Sm(1)-Pd(1) bond lengths are 2.87 Å. All Sm(1)-Pd(2) bond lengths are 3.35 Å. In the second Sm site, Sm(2) is bonded to twelve equivalent Pd(2) atoms to form distorted face-sharing SmPd12 cuboctahedra. All Sm(2)-Pd(2) bond lengths are 3.01 Å. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to one Sm(1) and three equivalent Si(1) atoms to form a mixture of edge and corner-sharing PdSmSi3 tetrahedra. All Pd(1)-Si(1) bond lengths are 2.47 Å. In the second Pd site, Pd(2) is bonded in a 2-coordinate geometry to one Sm(2), two equivalent Sm(1), and two equivalent Si(1) atoms. Both Pd(2)-Si(1) bond lengths are 2.42 Å. Si(1) is bonded in a 8-coordinate geometry to four equivalent Pd(1) and four equivalent Pd(2) atoms.