Ce2MnPd3Si4 crystallizes in the tetragonal P-4m2 space group. Ce(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), four equivalent Si(1), and four equivalent Si(2) atoms. Mn(1) is bonded to four equivalent Ce(1), four equivalent Pd(2), and four equivalent Si(1) atoms to form distorted MnCe4Si4Pd4 cuboctahedra that share corners with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, corners with four equivalent Pd(3)Ce4Si4 tetrahedra, corners with eight equivalent Pd(1)Ce4Si4 tetrahedra, edges with two equivalent Pd(3)Ce4Si4 tetrahedra, faces with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, and faces with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Ce(1) and four equivalent Si(2) atoms to form distorted PdCe4Si4 tetrahedra that share corners with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, corners with eight equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, edges with two equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, edges with four equivalent Pd(1)Ce4Si4 tetrahedra, and faces with four equivalent Pd(3)Ce4Si4 tetrahedra. In the second Pd site, Pd(2) is bonded to four equivalent Ce(1), four equivalent Mn(1), and four equivalent Si(1) atoms to form distorted PdCe4Mn4Si4 cuboctahedra that share corners with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, corners with four equivalent Pd(1)Ce4Si4 tetrahedra, corners with eight equivalent Pd(3)Ce4Si4 tetrahedra, edges with two equivalent Pd(1)Ce4Si4 tetrahedra, faces with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, and faces with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra. In the third Pd site, Pd(3) is bonded to four equivalent Ce(1) and four equivalent Si(2) atoms to form distorted PdCe4Si4 tetrahedra that share corners with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, corners with eight equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, edges with two equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, edges with four equivalent Pd(3)Ce4Si4 tetrahedra, and faces with four equivalent Pd(1)Ce4Si4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), two equivalent Mn(1), two equivalent Pd(2), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ce(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.
Ce2MnPd3Si4 crystallizes in the tetragonal P-4m2 space group. Ce(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), four equivalent Si(1), and four equivalent Si(2) atoms. Both Ce(1)-Mn(1) bond lengths are 3.27 Å. Both Ce(1)-Pd(1) bond lengths are 3.30 Å. Both Ce(1)-Pd(2) bond lengths are 3.27 Å. Both Ce(1)-Pd(3) bond lengths are 3.30 Å. All Ce(1)-Si(1) bond lengths are 3.15 Å. All Ce(1)-Si(2) bond lengths are 3.17 Å. Mn(1) is bonded to four equivalent Ce(1), four equivalent Pd(2), and four equivalent Si(1) atoms to form distorted MnCe4Si4Pd4 cuboctahedra that share corners with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, corners with four equivalent Pd(3)Ce4Si4 tetrahedra, corners with eight equivalent Pd(1)Ce4Si4 tetrahedra, edges with two equivalent Pd(3)Ce4Si4 tetrahedra, faces with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, and faces with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra. All Mn(1)-Pd(2) bond lengths are 2.93 Å. All Mn(1)-Si(1) bond lengths are 2.49 Å. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Ce(1) and four equivalent Si(2) atoms to form distorted PdCe4Si4 tetrahedra that share corners with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, corners with eight equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, edges with two equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, edges with four equivalent Pd(1)Ce4Si4 tetrahedra, and faces with four equivalent Pd(3)Ce4Si4 tetrahedra. All Pd(1)-Si(2) bond lengths are 2.48 Å. In the second Pd site, Pd(2) is bonded to four equivalent Ce(1), four equivalent Mn(1), and four equivalent Si(1) atoms to form distorted PdCe4Mn4Si4 cuboctahedra that share corners with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, corners with four equivalent Pd(1)Ce4Si4 tetrahedra, corners with eight equivalent Pd(3)Ce4Si4 tetrahedra, edges with two equivalent Pd(1)Ce4Si4 tetrahedra, faces with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, and faces with four equivalent Pd(2)Ce4Mn4Si4 cuboctahedra. All Pd(2)-Si(1) bond lengths are 2.49 Å. In the third Pd site, Pd(3) is bonded to four equivalent Ce(1) and four equivalent Si(2) atoms to form distorted PdCe4Si4 tetrahedra that share corners with four equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, corners with eight equivalent Pd(2)Ce4Mn4Si4 cuboctahedra, edges with two equivalent Mn(1)Ce4Si4Pd4 cuboctahedra, edges with four equivalent Pd(3)Ce4Si4 tetrahedra, and faces with four equivalent Pd(1)Ce4Si4 tetrahedra. All Pd(3)-Si(2) bond lengths are 2.48 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), two equivalent Mn(1), two equivalent Pd(2), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.37 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ce(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.