MgCo3BiO8 is beta indium sulfide-derived structured and crystallizes in the trigonal R3 space group. Mg(1) is bonded to one O(2) and three equivalent O(3) atoms to form MgO4 tetrahedra that share corners with three equivalent Bi(1)O6 octahedra and corners with nine equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. Co(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. Bi(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form BiO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra and edges with six equivalent Co(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1) and three equivalent Co(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Co(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to three equivalent Co(1) atoms.
MgCo3BiO8 is beta indium sulfide-derived structured and crystallizes in the trigonal R3 space group. Mg(1) is bonded to one O(2) and three equivalent O(3) atoms to form MgO4 tetrahedra that share corners with three equivalent Bi(1)O6 octahedra and corners with nine equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. The Mg(1)-O(2) bond length is 2.10 Å. All Mg(1)-O(3) bond lengths are 2.01 Å. Co(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. The Co(1)-O(2) bond length is 2.05 Å. The Co(1)-O(4) bond length is 1.97 Å. Both Co(1)-O(1) bond lengths are 2.02 Å. There is one shorter (2.11 Å) and one longer (2.12 Å) Co(1)-O(3) bond length. Bi(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form BiO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra and edges with six equivalent Co(1)O6 octahedra. All Bi(1)-O(1) bond lengths are 2.14 Å. All Bi(1)-O(3) bond lengths are 2.15 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to one Mg(1) and three equivalent Co(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Co(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to three equivalent Co(1) atoms.