MgYb(FeO2)2 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent O(1) atoms to form edge-sharing MgO6 octahedra. Yb(1) is bonded to six equivalent O(2) atoms to form edge-sharing YbO6 octahedra. Fe(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mg(1) and three equivalent Fe(1) atoms to form a mixture of corner and edge-sharing OMg3Fe3 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Yb(1) and one Fe(1) atom.
MgYb(FeO2)2 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent O(1) atoms to form edge-sharing MgO6 octahedra. All Mg(1)-O(1) bond lengths are 2.19 Å. Yb(1) is bonded to six equivalent O(2) atoms to form edge-sharing YbO6 octahedra. All Yb(1)-O(2) bond lengths are 2.25 Å. Fe(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2) and three equivalent O(1) atoms. The Fe(1)-O(2) bond length is 1.82 Å. All Fe(1)-O(1) bond lengths are 2.25 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mg(1) and three equivalent Fe(1) atoms to form a mixture of corner and edge-sharing OMg3Fe3 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Yb(1) and one Fe(1) atom.