MgFe(SbO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(3), one O(4), and one O(7) atom. Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-43°. In the second Sb site, Sb(2) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-46°. In the third Sb site, Sb(3) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 36-46°. In the fourth Sb site, Sb(4) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-44°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Fe(1), one Sb(2), and one Sb(3) atom to form distorted edge-sharing OMgFeSb2 trigonal pyramids. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(1), and one Sb(4) atom. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), one Sb(2), and one Sb(3) atom to form distorted edge-sharing OMgFeSb2 trigonal pyramids. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Sb(2) and one Sb(4) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Mg(1), one Fe(1), one Sb(2), and one Sb(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a T-shaped geometry to one Fe(1), one Sb(2), and one Sb(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(4) atom. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Mg(1), one Fe(1), one Sb(1), and one Sb(3) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Mg(1), one Sb(2), and one Sb(3) atom.
MgFe(SbO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(3), one O(4), and one O(7) atom. The Mg(1)-O(1) bond length is 2.10 Å. The Mg(1)-O(11) bond length is 2.05 Å. The Mg(1)-O(12) bond length is 2.20 Å. The Mg(1)-O(3) bond length is 2.02 Å. The Mg(1)-O(4) bond length is 2.28 Å. The Mg(1)-O(7) bond length is 2.18 Å. Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom. The Fe(1)-O(1) bond length is 2.32 Å. The Fe(1)-O(11) bond length is 2.28 Å. The Fe(1)-O(4) bond length is 2.13 Å. The Fe(1)-O(7) bond length is 2.14 Å. The Fe(1)-O(8) bond length is 2.01 Å. The Fe(1)-O(9) bond length is 2.22 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-43°. The Sb(1)-O(10) bond length is 1.98 Å. The Sb(1)-O(11) bond length is 2.12 Å. The Sb(1)-O(2) bond length is 1.96 Å. The Sb(1)-O(3) bond length is 2.02 Å. The Sb(1)-O(5) bond length is 1.97 Å. The Sb(1)-O(8) bond length is 2.05 Å. In the second Sb site, Sb(2) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-46°. The Sb(2)-O(1) bond length is 2.04 Å. The Sb(2)-O(12) bond length is 2.02 Å. The Sb(2)-O(4) bond length is 2.08 Å. The Sb(2)-O(6) bond length is 1.92 Å. The Sb(2)-O(7) bond length is 2.11 Å. The Sb(2)-O(9) bond length is 1.99 Å. In the third Sb site, Sb(3) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 36-46°. The Sb(3)-O(1) bond length is 2.10 Å. The Sb(3)-O(11) bond length is 2.12 Å. The Sb(3)-O(12) bond length is 1.98 Å. The Sb(3)-O(2) bond length is 1.92 Å. The Sb(3)-O(4) bond length is 2.02 Å. The Sb(3)-O(9) bond length is 2.02 Å. In the fourth Sb site, Sb(4) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing SbO6 octahedra. The corner-sharing octahedral tilt angles range from 34-44°. The Sb(4)-O(10) bond length is 1.97 Å. The Sb(4)-O(3) bond length is 2.05 Å. The Sb(4)-O(5) bond length is 1.97 Å. The Sb(4)-O(6) bond length is 1.96 Å. The Sb(4)-O(7) bond length is 2.12 Å. The Sb(4)-O(8) bond length is 2.03 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Fe(1), one Sb(2), and one Sb(3) atom to form distorted edge-sharing OMgFeSb2 trigonal pyramids. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(1), and one Sb(4) atom. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), one Sb(2), and one Sb(3) atom to form distorted edge-sharing OMgFeSb2 trigonal pyramids. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Sb(2) and one Sb(4) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Mg(1), one Fe(1), one Sb(2), and one Sb(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(1), one Sb(1), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a T-shaped geometry to one Fe(1), one Sb(2), and one Sb(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Sb(1) and one Sb(4) atom. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Mg(1), one Fe(1), one Sb(1), and one Sb(3) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Mg(1), one Sb(2), and one Sb(3) atom.