Ho3WB7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 11-coordinate geometry to two equivalent B(2), two equivalent B(4), three equivalent B(1), and four equivalent B(3) atoms. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to four equivalent B(2) and six equivalent B(1) atoms. W(1) is bonded in a 10-coordinate geometry to two equivalent B(4), four equivalent B(2), and four equivalent B(3) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to three equivalent Ho(1), three equivalent Ho(2), one B(2), and two equivalent B(1) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent W(1), one B(1), one B(2), and one B(3) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent W(1), one B(2), one B(3), and one B(4) atom. In the fourth B site, B(4) is bonded in a 8-coordinate geometry to four equivalent Ho(1), two equivalent W(1), and two equivalent B(3) atoms.
Ho3WB7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 11-coordinate geometry to two equivalent B(2), two equivalent B(4), three equivalent B(1), and four equivalent B(3) atoms. Both Ho(1)-B(2) bond lengths are 2.65 Å. Both Ho(1)-B(4) bond lengths are 2.68 Å. There is one shorter (2.65 Å) and two longer (2.73 Å) Ho(1)-B(1) bond lengths. There are two shorter (2.65 Å) and two longer (2.67 Å) Ho(1)-B(3) bond lengths. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to four equivalent B(2) and six equivalent B(1) atoms. All Ho(2)-B(2) bond lengths are 2.64 Å. There are four shorter (2.70 Å) and two longer (2.71 Å) Ho(2)-B(1) bond lengths. W(1) is bonded in a 10-coordinate geometry to two equivalent B(4), four equivalent B(2), and four equivalent B(3) atoms. Both W(1)-B(4) bond lengths are 2.33 Å. All W(1)-B(2) bond lengths are 2.38 Å. All W(1)-B(3) bond lengths are 2.35 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to three equivalent Ho(1), three equivalent Ho(2), one B(2), and two equivalent B(1) atoms. The B(1)-B(2) bond length is 1.83 Å. Both B(1)-B(1) bond lengths are 1.97 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent W(1), one B(1), one B(2), and one B(3) atom. The B(2)-B(2) bond length is 1.95 Å. The B(2)-B(3) bond length is 1.91 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent W(1), one B(2), one B(3), and one B(4) atom. The B(3)-B(3) bond length is 1.84 Å. The B(3)-B(4) bond length is 1.82 Å. In the fourth B site, B(4) is bonded in a 8-coordinate geometry to four equivalent Ho(1), two equivalent W(1), and two equivalent B(3) atoms.