Eu2IrPd3Si4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to two equivalent Ir(1), two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), four equivalent Si(1), and four equivalent Si(2) atoms. Ir(1) is bonded to four equivalent Eu(1) and four equivalent Si(1) atoms to form distorted IrEu4Si4 tetrahedra that share corners with four equivalent Pd(3)Eu4Si4 tetrahedra, corners with eight equivalent Pd(1)Eu4Si4 tetrahedra, edges with two equivalent Pd(3)Eu4Si4 tetrahedra, edges with four equivalent Ir(1)Eu4Si4 tetrahedra, and faces with four equivalent Pd(2)Eu4Si4 tetrahedra. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Eu(1) and four equivalent Si(2) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Pd(2)Eu4Si4 tetrahedra, corners with eight equivalent Ir(1)Eu4Si4 tetrahedra, edges with two equivalent Pd(2)Eu4Si4 tetrahedra, edges with four equivalent Pd(1)Eu4Si4 tetrahedra, and faces with four equivalent Pd(3)Eu4Si4 tetrahedra. In the second Pd site, Pd(2) is bonded to four equivalent Eu(1) and four equivalent Si(1) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Pd(1)Eu4Si4 tetrahedra, corners with eight equivalent Pd(3)Eu4Si4 tetrahedra, edges with two equivalent Pd(1)Eu4Si4 tetrahedra, edges with four equivalent Pd(2)Eu4Si4 tetrahedra, and faces with four equivalent Ir(1)Eu4Si4 tetrahedra. In the third Pd site, Pd(3) is bonded to four equivalent Eu(1) and four equivalent Si(2) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Ir(1)Eu4Si4 tetrahedra, corners with eight equivalent Pd(2)Eu4Si4 tetrahedra, edges with two equivalent Ir(1)Eu4Si4 tetrahedra, edges with four equivalent Pd(3)Eu4Si4 tetrahedra, and faces with four equivalent Pd(1)Eu4Si4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ir(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 Eu(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.
Eu2IrPd3Si4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to two equivalent Ir(1), two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), four equivalent Si(1), and four equivalent Si(2) atoms. Both Eu(1)-Ir(1) bond lengths are 3.30 Å. Both Eu(1)-Pd(1) bond lengths are 3.30 Å. Both Eu(1)-Pd(2) bond lengths are 3.30 Å. Both Eu(1)-Pd(3) bond lengths are 3.30 Å. All Eu(1)-Si(1) bond lengths are 3.23 Å. All Eu(1)-Si(2) bond lengths are 3.22 Å. Ir(1) is bonded to four equivalent Eu(1) and four equivalent Si(1) atoms to form distorted IrEu4Si4 tetrahedra that share corners with four equivalent Pd(3)Eu4Si4 tetrahedra, corners with eight equivalent Pd(1)Eu4Si4 tetrahedra, edges with two equivalent Pd(3)Eu4Si4 tetrahedra, edges with four equivalent Ir(1)Eu4Si4 tetrahedra, and faces with four equivalent Pd(2)Eu4Si4 tetrahedra. All Ir(1)-Si(1) bond lengths are 2.47 Å. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Eu(1) and four equivalent Si(2) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Pd(2)Eu4Si4 tetrahedra, corners with eight equivalent Ir(1)Eu4Si4 tetrahedra, edges with two equivalent Pd(2)Eu4Si4 tetrahedra, edges with four equivalent Pd(1)Eu4Si4 tetrahedra, and faces with four equivalent Pd(3)Eu4Si4 tetrahedra. All Pd(1)-Si(2) bond lengths are 2.48 Å. In the second Pd site, Pd(2) is bonded to four equivalent Eu(1) and four equivalent Si(1) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Pd(1)Eu4Si4 tetrahedra, corners with eight equivalent Pd(3)Eu4Si4 tetrahedra, edges with two equivalent Pd(1)Eu4Si4 tetrahedra, edges with four equivalent Pd(2)Eu4Si4 tetrahedra, and faces with four equivalent Ir(1)Eu4Si4 tetrahedra. All Pd(2)-Si(1) bond lengths are 2.47 Å. In the third Pd site, Pd(3) is bonded to four equivalent Eu(1) and four equivalent Si(2) atoms to form distorted PdEu4Si4 tetrahedra that share corners with four equivalent Ir(1)Eu4Si4 tetrahedra, corners with eight equivalent Pd(2)Eu4Si4 tetrahedra, edges with two equivalent Ir(1)Eu4Si4 tetrahedra, edges with four equivalent Pd(3)Eu4Si4 tetrahedra, and faces with four equivalent Pd(1)Eu4Si4 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 Eu(1), two equivalent Ir(1), two equivalent Pd(2), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.48 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.