MgFe3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing FeO5 trigonal bipyramids. In the second Fe site, Fe(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing FeO5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Fe(2) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Mg(1) and one Fe(1) atom. In the third O site, O(1) is bonded to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms to form a mixture of distorted corner and edge-sharing OMgFe3 trigonal pyramids. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms.
MgFe3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. The Mg(1)-O(3) bond length is 2.09 Å. Both Mg(1)-O(1) bond lengths are 2.19 Å. Both Mg(1)-O(2) bond lengths are 2.38 Å. Both Mg(1)-O(4) bond lengths are 2.02 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing FeO5 trigonal bipyramids. The Fe(1)-O(4) bond length is 1.80 Å. There is one shorter (2.00 Å) and one longer (2.04 Å) Fe(1)-O(1) bond length. There is one shorter (2.00 Å) and one longer (2.03 Å) Fe(1)-O(2) bond length. In the second Fe site, Fe(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing FeO5 trigonal bipyramids. The Fe(2)-O(3) bond length is 1.84 Å. Both Fe(2)-O(1) bond lengths are 1.97 Å. Both Fe(2)-O(2) bond lengths are 1.96 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Fe(2) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Mg(1) and one Fe(1) atom. In the third O site, O(1) is bonded to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms to form a mixture of distorted corner and edge-sharing OMgFe3 trigonal pyramids. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms.