MgFe2(SbO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and edges with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra and corners with four equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(4), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(2), and one Sb(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Fe(2), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Fe(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(2), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Fe(2), one Sb(1), and one Sb(2) atom.
MgFe2(SbO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The Mg(1)-O(1) bond length is 2.12 Å. The Mg(1)-O(2) bond length is 2.31 Å. The Mg(1)-O(3) bond length is 1.96 Å. The Mg(1)-O(4) bond length is 2.05 Å. The Mg(1)-O(7) bond length is 2.11 Å. The Mg(1)-O(8) bond length is 2.38 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom. The Fe(1)-O(1) bond length is 2.14 Å. The Fe(1)-O(2) bond length is 2.54 Å. The Fe(1)-O(5) bond length is 1.95 Å. The Fe(1)-O(6) bond length is 2.04 Å. The Fe(1)-O(7) bond length is 2.15 Å. The Fe(1)-O(8) bond length is 2.48 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and edges with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. The Fe(2)-O(1) bond length is 2.19 Å. The Fe(2)-O(2) bond length is 2.48 Å. The Fe(2)-O(3) bond length is 1.97 Å. The Fe(2)-O(5) bond length is 1.97 Å. The Fe(2)-O(7) bond length is 2.19 Å. The Fe(2)-O(8) bond length is 2.48 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra and corners with four equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. The Sb(1)-O(2) bond length is 2.01 Å. The Sb(1)-O(3) bond length is 1.96 Å. The Sb(1)-O(4) bond length is 2.11 Å. The Sb(1)-O(5) bond length is 1.98 Å. The Sb(1)-O(6) bond length is 2.12 Å. The Sb(1)-O(8) bond length is 2.01 Å. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(4), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and edges with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-56°. The Sb(2)-O(1) bond length is 1.97 Å. The Sb(2)-O(2) bond length is 2.18 Å. The Sb(2)-O(4) bond length is 2.05 Å. The Sb(2)-O(6) bond length is 2.05 Å. The Sb(2)-O(7) bond length is 1.97 Å. The Sb(2)-O(8) bond length is 2.17 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(2), and one Sb(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Fe(2), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Fe(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(2), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Fe(1), one Fe(2), one Sb(1), and one Sb(2) atom.