Ho(IrSi)2 crystallizes in the tetragonal P4/nmm space group. Ho(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ho(1) and four equivalent Si(2) atoms to form distorted IrHo4Si4 tetrahedra that share corners with twelve equivalent Si(1)Ho4Ir4 tetrahedra, edges with two equivalent Si(1)Ho4Ir4 tetrahedra, edges with four equivalent Ir(1)Ho4Si4 tetrahedra, and faces with four equivalent Ir(1)Ho4Si4 tetrahedra. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent Ho(1) and four equivalent Ir(2) atoms to form distorted SiHo4Ir4 tetrahedra that share corners with twelve equivalent Ir(1)Ho4Si4 tetrahedra, edges with two equivalent Ir(1)Ho4Si4 tetrahedra, edges with four equivalent Si(1)Ho4Ir4 tetrahedra, and faces with four equivalent Si(1)Ho4Ir4 tetrahedra. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ir(2), and four equivalent Ir(1) atoms.
Ho(IrSi)2 crystallizes in the tetragonal P4/nmm space group. Ho(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. All Ho(1)-Ir(1) bond lengths are 3.19 Å. All Ho(1)-Ir(2) bond lengths are 3.09 Å. All Ho(1)-Si(1) bond lengths are 3.16 Å. All Ho(1)-Si(2) bond lengths are 3.11 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ho(1) and four equivalent Si(2) atoms to form distorted IrHo4Si4 tetrahedra that share corners with twelve equivalent Si(1)Ho4Ir4 tetrahedra, edges with two equivalent Si(1)Ho4Ir4 tetrahedra, edges with four equivalent Ir(1)Ho4Si4 tetrahedra, and faces with four equivalent Ir(1)Ho4Si4 tetrahedra. All Ir(1)-Si(2) bond lengths are 2.40 Å. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Si(2), and four equivalent Si(1) atoms. The Ir(2)-Si(2) bond length is 2.34 Å. All Ir(2)-Si(1) bond lengths are 2.39 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent Ho(1) and four equivalent Ir(2) atoms to form distorted SiHo4Ir4 tetrahedra that share corners with twelve equivalent Ir(1)Ho4Si4 tetrahedra, edges with two equivalent Ir(1)Ho4Si4 tetrahedra, edges with four equivalent Si(1)Ho4Ir4 tetrahedra, and faces with four equivalent Si(1)Ho4Ir4 tetrahedra. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ir(2), and four equivalent Ir(1) atoms.