MgNb4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(5), one O(6), one O(7), and one O(9) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 26-62°. In the second Nb site, Nb(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 29-62°. In the third Nb site, Nb(3) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), and one O(7) atom to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 29-56°. In the fourth Nb site, Nb(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 26-56°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(3), and one Nb(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nb(2), one Nb(3), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Nb(3), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Nb(1), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a T-shaped geometry to one Mg(1), one Nb(2), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Nb(1), and one Nb(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Nb(2), and one Nb(3) atom.
MgNb4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(5), one O(6), one O(7), and one O(9) atom. The Mg(1)-O(1) bond length is 2.46 Å. The Mg(1)-O(10) bond length is 2.02 Å. The Mg(1)-O(5) bond length is 2.19 Å. The Mg(1)-O(6) bond length is 2.01 Å. The Mg(1)-O(7) bond length is 2.08 Å. The Mg(1)-O(9) bond length is 2.02 Å. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 26-62°. The Nb(1)-O(1) bond length is 2.38 Å. The Nb(1)-O(2) bond length is 2.02 Å. The Nb(1)-O(3) bond length is 2.28 Å. The Nb(1)-O(6) bond length is 1.91 Å. The Nb(1)-O(8) bond length is 1.85 Å. The Nb(1)-O(9) bond length is 1.98 Å. In the second Nb site, Nb(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 29-62°. The Nb(2)-O(1) bond length is 1.93 Å. The Nb(2)-O(10) bond length is 2.14 Å. The Nb(2)-O(2) bond length is 2.03 Å. The Nb(2)-O(4) bond length is 2.14 Å. The Nb(2)-O(6) bond length is 2.21 Å. The Nb(2)-O(7) bond length is 2.04 Å. In the third Nb site, Nb(3) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), and one O(7) atom to form a mixture of distorted corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 29-56°. The Nb(3)-O(1) bond length is 2.26 Å. The Nb(3)-O(10) bond length is 1.91 Å. The Nb(3)-O(3) bond length is 2.18 Å. The Nb(3)-O(4) bond length is 2.05 Å. The Nb(3)-O(5) bond length is 1.91 Å. The Nb(3)-O(7) bond length is 1.98 Å. In the fourth Nb site, Nb(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 26-56°. The Nb(4)-O(2) bond length is 2.18 Å. The Nb(4)-O(3) bond length is 1.97 Å. The Nb(4)-O(4) bond length is 2.08 Å. The Nb(4)-O(5) bond length is 2.12 Å. The Nb(4)-O(8) bond length is 2.09 Å. The Nb(4)-O(9) bond length is 2.04 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(3), and one Nb(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nb(2), one Nb(3), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Nb(3), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Nb(1), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a T-shaped geometry to one Mg(1), one Nb(2), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Nb(1), and one Nb(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Nb(2), and one Nb(3) atom.