Ho2Si3 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to two equivalent Si(2), four equivalent Si(1), and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), and two equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), one Si(1), and two equivalent Si(2) atoms.
Ho2Si3 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. Both Ho(1)-Si(1) bond lengths are 2.91 Å. Both Ho(1)-Si(3) bond lengths are 3.06 Å. All Ho(1)-Si(2) bond lengths are 2.94 Å. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to two equivalent Si(2), four equivalent Si(1), and four equivalent Si(3) atoms. Both Ho(2)-Si(2) bond lengths are 3.11 Å. All Ho(2)-Si(1) bond lengths are 3.07 Å. All Ho(2)-Si(3) bond lengths are 2.96 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), and one Si(3) atom. The Si(1)-Si(3) bond length is 2.33 Å. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), and two equivalent Si(3) atoms. Both Si(2)-Si(3) bond lengths are 2.38 Å. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), one Si(1), and two equivalent Si(2) atoms.