HoCoB4 crystallizes in the orthorhombic Pbam space group. Ho(1) is bonded in a 14-coordinate geometry to two equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(4) atoms. Co(1) is bonded in a 10-coordinate geometry to two equivalent B(2), two equivalent B(3), two equivalent B(4), and four equivalent B(1) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Co(1), one B(1), one B(2), and one B(3) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(1), one B(2), and one B(4) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(1), and two equivalent B(4) atoms. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(2), and two equivalent B(3) atoms.
HoCoB4 crystallizes in the orthorhombic Pbam space group. Ho(1) is bonded in a 14-coordinate geometry to two equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(4) atoms. Both Ho(1)-B(1) bond lengths are 2.57 Å. There are two shorter (2.66 Å) and two longer (2.68 Å) Ho(1)-B(2) bond lengths. There are two shorter (2.63 Å) and two longer (2.70 Å) Ho(1)-B(3) bond lengths. There are two shorter (2.66 Å) and two longer (2.69 Å) Ho(1)-B(4) bond lengths. Co(1) is bonded in a 10-coordinate geometry to two equivalent B(2), two equivalent B(3), two equivalent B(4), and four equivalent B(1) atoms. Both Co(1)-B(2) bond lengths are 2.25 Å. Both Co(1)-B(3) bond lengths are 2.24 Å. Both Co(1)-B(4) bond lengths are 2.19 Å. There are two shorter (2.27 Å) and two longer (2.29 Å) Co(1)-B(1) bond lengths. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Co(1), one B(1), one B(2), and one B(3) atom. The B(1)-B(1) bond length is 1.69 Å. The B(1)-B(2) bond length is 1.72 Å. The B(1)-B(3) bond length is 1.72 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(1), one B(2), and one B(4) atom. The B(2)-B(2) bond length is 1.79 Å. The B(2)-B(4) bond length is 1.78 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(1), and two equivalent B(4) atoms. There is one shorter (1.79 Å) and one longer (1.83 Å) B(3)-B(4) bond length. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Ho(1), two equivalent Co(1), one B(2), and two equivalent B(3) atoms.