Ba2Ho2Co4O11 crystallizes in the orthorhombic Pmma space group. Ba(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Co(1)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, faces with two equivalent Co(3)O5 square pyramids, and faces with two equivalent Co(4)O5 square pyramids. Ho(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. In the second Co site, Co(2) is bonded to one O(6), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra, corners with two equivalent Co(4)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. In the third Co site, Co(3) is bonded to one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted CoO5 square pyramids that share corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Co(4)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 11°. In the fourth Co site, Co(4) is bonded to one O(5), two equivalent O(2), and two equivalent O(4) atoms to form CoO5 square pyramids that share corners with two equivalent Co(2)O6 octahedra, corners with three equivalent Co(3)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. There are seven inequivalent O sites. In the first O site, O(5) is bonded to four equivalent Ba(1), one Co(3), and one Co(4) atom to form distorted OBa4Co2 octahedra that share corners with four equivalent O(6)Ba4Co2 octahedra, corners with eight equivalent O(3)Ba2Ho2Co2 octahedra, edges with two equivalent O(5)Ba4Co2 octahedra, and edges with two equivalent O(6)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 6-64°. In the second O site, O(6) is bonded to four equivalent Ba(1), one Co(1), and one Co(2) atom to form distorted OBa4Co2 octahedra that share corners with four equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(6)Ba4Co2 octahedra, and faces with four equivalent O(3)Ba2Ho2Co2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the third O site, O(7) is bonded in a distorted linear geometry to four equivalent Ho(1), one Co(1), and one Co(2) atom. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(1), and one Co(3) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(2), and one Co(4) atom. In the sixth O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ho(1), one Co(1), and one Co(2) atom to form distorted OBa2Ho2Co2 octahedra that share corners with two equivalent O(3)Ba2Ho2Co2 octahedra, corners with four equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(3)Ba2Ho2Co2 octahedra, and faces with two equivalent O(6)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 12-64°. In the seventh O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(3), and one Co(4) atom.
Ba2Ho2Co4O11 crystallizes in the orthorhombic Pmma space group. Ba(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Co(1)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, faces with two equivalent Co(3)O5 square pyramids, and faces with two equivalent Co(4)O5 square pyramids. Both Ba(1)-O(1) bond lengths are 3.00 Å. Both Ba(1)-O(2) bond lengths are 3.07 Å. Both Ba(1)-O(3) bond lengths are 2.96 Å. Both Ba(1)-O(4) bond lengths are 3.08 Å. Both Ba(1)-O(5) bond lengths are 2.72 Å. Both Ba(1)-O(6) bond lengths are 2.84 Å. Ho(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. Both Ho(1)-O(1) bond lengths are 2.51 Å. Both Ho(1)-O(2) bond lengths are 2.46 Å. Both Ho(1)-O(3) bond lengths are 2.47 Å. Both Ho(1)-O(4) bond lengths are 2.52 Å. Both Ho(1)-O(7) bond lengths are 2.67 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. The Co(1)-O(6) bond length is 1.84 Å. The Co(1)-O(7) bond length is 1.83 Å. Both Co(1)-O(1) bond lengths are 2.13 Å. Both Co(1)-O(3) bond lengths are 1.98 Å. In the second Co site, Co(2) is bonded to one O(6), one O(7), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra, corners with two equivalent Co(4)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. The Co(2)-O(6) bond length is 2.03 Å. The Co(2)-O(7) bond length is 1.93 Å. Both Co(2)-O(2) bond lengths are 2.14 Å. Both Co(2)-O(3) bond lengths are 1.96 Å. In the third Co site, Co(3) is bonded to one O(5), two equivalent O(1), and two equivalent O(4) atoms to form distorted CoO5 square pyramids that share corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Co(4)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 11°. The Co(3)-O(5) bond length is 2.36 Å. Both Co(3)-O(1) bond lengths are 1.83 Å. Both Co(3)-O(4) bond lengths are 1.93 Å. In the fourth Co site, Co(4) is bonded to one O(5), two equivalent O(2), and two equivalent O(4) atoms to form CoO5 square pyramids that share corners with two equivalent Co(2)O6 octahedra, corners with three equivalent Co(3)O5 square pyramids, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. The Co(4)-O(5) bond length is 1.92 Å. Both Co(4)-O(2) bond lengths are 1.85 Å. Both Co(4)-O(4) bond lengths are 2.04 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded to four equivalent Ba(1), one Co(3), and one Co(4) atom to form distorted OBa4Co2 octahedra that share corners with four equivalent O(6)Ba4Co2 octahedra, corners with eight equivalent O(3)Ba2Ho2Co2 octahedra, edges with two equivalent O(5)Ba4Co2 octahedra, and edges with two equivalent O(6)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 6-64°. In the second O site, O(6) is bonded to four equivalent Ba(1), one Co(1), and one Co(2) atom to form distorted OBa4Co2 octahedra that share corners with four equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(6)Ba4Co2 octahedra, and faces with four equivalent O(3)Ba2Ho2Co2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the third O site, O(7) is bonded in a distorted linear geometry to four equivalent Ho(1), one Co(1), and one Co(2) atom. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(1), and one Co(3) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(2), and one Co(4) atom. In the sixth O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ho(1), one Co(1), and one Co(2) atom to form distorted OBa2Ho2Co2 octahedra that share corners with two equivalent O(3)Ba2Ho2Co2 octahedra, corners with four equivalent O(5)Ba4Co2 octahedra, edges with two equivalent O(3)Ba2Ho2Co2 octahedra, and faces with two equivalent O(6)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 12-64°. In the seventh O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), one Co(3), and one Co(4) atom.