Ba2MgTb2Co4O11 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(6), and four equivalent O(1) atoms. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Co(1), four equivalent O(1), and four equivalent O(3) atoms. Tb(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 5-coordinate geometry to one Mg(1), one O(4), two equivalent O(1), and two equivalent O(3) atoms. In the second Co site, Co(2) is bonded to one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form distorted corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), two equivalent Tb(1), one Co(1), and one Co(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Tb(1), and two equivalent Co(2) atoms to form distorted OBa2Tb2Co2 octahedra that share corners with two equivalent O(2)Ba2Tb2Co2 octahedra, edges with two equivalent O(2)Ba2Tb2Co2 octahedra, faces with two equivalent O(6)Ba4Co2 octahedra, and faces with two equivalent O(5)Tb4Co2 octahedra. The corner-sharing octahedral tilt angles are 8°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Tb(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Ba(1) and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded to four equivalent Tb(1) and two equivalent Co(2) atoms to form distorted OTb4Co2 octahedra that share corners with two equivalent O(6)Ba4Co2 octahedra, edges with two equivalent O(5)Tb4Co2 octahedra, and faces with four equivalent O(2)Ba2Tb2Co2 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to four equivalent Ba(1) and two equivalent Co(2) atoms to form OBa4Co2 octahedra that share corners with two equivalent O(5)Tb4Co2 octahedra, edges with two equivalent O(6)Ba4Co2 octahedra, and faces with four equivalent O(2)Ba2Tb2Co2 octahedra. The corner-sharing octahedra are not tilted.
Ba2MgTb2Co4O11 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(6), and four equivalent O(1) atoms. Both Ba(1)-O(2) bond lengths are 2.92 Å. Both Ba(1)-O(4) bond lengths are 2.93 Å. Both Ba(1)-O(6) bond lengths are 2.69 Å. All Ba(1)-O(1) bond lengths are 3.27 Å. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Co(1), four equivalent O(1), and four equivalent O(3) atoms. Both Mg(1)-Co(1) bond lengths are 2.29 Å. All Mg(1)-O(1) bond lengths are 2.31 Å. All Mg(1)-O(3) bond lengths are 2.32 Å. Tb(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. Both Tb(1)-O(2) bond lengths are 2.52 Å. Both Tb(1)-O(3) bond lengths are 2.72 Å. Both Tb(1)-O(5) bond lengths are 2.57 Å. All Tb(1)-O(1) bond lengths are 2.48 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 5-coordinate geometry to one Mg(1), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The Co(1)-O(4) bond length is 1.79 Å. Both Co(1)-O(1) bond lengths are 1.97 Å. Both Co(1)-O(3) bond lengths are 2.15 Å. In the second Co site, Co(2) is bonded to one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form distorted corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. The Co(2)-O(5) bond length is 1.97 Å. The Co(2)-O(6) bond length is 2.11 Å. Both Co(2)-O(1) bond lengths are 2.37 Å. Both Co(2)-O(2) bond lengths are 1.92 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), two equivalent Tb(1), one Co(1), and one Co(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Tb(1), and two equivalent Co(2) atoms to form distorted OBa2Tb2Co2 octahedra that share corners with two equivalent O(2)Ba2Tb2Co2 octahedra, edges with two equivalent O(2)Ba2Tb2Co2 octahedra, faces with two equivalent O(6)Ba4Co2 octahedra, and faces with two equivalent O(5)Tb4Co2 octahedra. The corner-sharing octahedral tilt angles are 8°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Tb(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Ba(1) and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded to four equivalent Tb(1) and two equivalent Co(2) atoms to form distorted OTb4Co2 octahedra that share corners with two equivalent O(6)Ba4Co2 octahedra, edges with two equivalent O(5)Tb4Co2 octahedra, and faces with four equivalent O(2)Ba2Tb2Co2 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to four equivalent Ba(1) and two equivalent Co(2) atoms to form OBa4Co2 octahedra that share corners with two equivalent O(5)Tb4Co2 octahedra, edges with two equivalent O(6)Ba4Co2 octahedra, and faces with four equivalent O(2)Ba2Tb2Co2 octahedra. The corner-sharing octahedra are not tilted.