Ba2HoCoCu2O7 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Ho(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. Co(1) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. Cu(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing CuO5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(1), one Co(1), and one Cu(1) atom to form distorted OBa4CoCu octahedra that share corners with four equivalent O(4)Ba4Co2 octahedra, corners with five equivalent O(2)Ba4CoCu octahedra, edges with four equivalent O(2)Ba4CoCu octahedra, and faces with two equivalent O(4)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-69°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded to four equivalent Ba(1) and two equivalent Co(1) atoms to form distorted OBa4Co2 octahedra that share corners with two equivalent O(4)Ba4Co2 octahedra, corners with eight equivalent O(2)Ba4CoCu octahedra, edges with two equivalent O(4)Ba4Co2 octahedra, and faces with four equivalent O(2)Ba4CoCu octahedra. The corner-sharing octahedral tilt angles range from 0-69°.
Ba2HoCoCu2O7 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Both Ba(1)-O(1) bond lengths are 3.02 Å. Both Ba(1)-O(3) bond lengths are 3.00 Å. Both Ba(1)-O(4) bond lengths are 2.91 Å. All Ba(1)-O(2) bond lengths are 2.77 Å. Ho(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. All Ho(1)-O(1) bond lengths are 2.42 Å. All Ho(1)-O(3) bond lengths are 2.40 Å. Co(1) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. Both Co(1)-O(2) bond lengths are 1.81 Å. Both Co(1)-O(4) bond lengths are 1.96 Å. Cu(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing CuO5 square pyramids. The Cu(1)-O(2) bond length is 2.44 Å. Both Cu(1)-O(1) bond lengths are 1.94 Å. Both Cu(1)-O(3) bond lengths are 1.97 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(1), one Co(1), and one Cu(1) atom to form distorted OBa4CoCu octahedra that share corners with four equivalent O(4)Ba4Co2 octahedra, corners with five equivalent O(2)Ba4CoCu octahedra, edges with four equivalent O(2)Ba4CoCu octahedra, and faces with two equivalent O(4)Ba4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-69°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ho(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded to four equivalent Ba(1) and two equivalent Co(1) atoms to form distorted OBa4Co2 octahedra that share corners with two equivalent O(4)Ba4Co2 octahedra, corners with eight equivalent O(2)Ba4CoCu octahedra, edges with two equivalent O(4)Ba4Co2 octahedra, and faces with four equivalent O(2)Ba4CoCu octahedra. The corner-sharing octahedral tilt angles range from 0-69°.