Na7MgNbO6 crystallizes in the triclinic P1 space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(4) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. In the fifth Na site, Na(5) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. In the sixth Na site, Na(6) is bonded in a 3-coordinate geometry to one O(2), one O(3), one O(4), and one O(5) atom. In the seventh Na site, Na(7) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(6) atom. Mg(1) is bonded in a 3-coordinate geometry to one O(1), one O(5), and one O(6) atom. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(5), one Mg(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Na(6), one Na(7), and one Nb(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(6), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Na(6), one Na(7), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(2), one Na(4), one Na(5), one Na(6), one Mg(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(7), one Mg(1), and one Nb(1) atom.
Na7MgNbO6 crystallizes in the triclinic P1 space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(4) atom. The Na(1)-O(1) bond length is 2.53 Å. The Na(1)-O(3) bond length is 2.67 Å. The Na(1)-O(4) bond length is 2.29 Å. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. The Na(2)-O(1) bond length is 2.33 Å. The Na(2)-O(2) bond length is 2.36 Å. The Na(2)-O(3) bond length is 2.83 Å. The Na(2)-O(5) bond length is 2.35 Å. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. The Na(3)-O(1) bond length is 2.34 Å. The Na(3)-O(3) bond length is 2.36 Å. The Na(3)-O(4) bond length is 2.81 Å. The Na(3)-O(6) bond length is 2.34 Å. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. The Na(4)-O(2) bond length is 2.80 Å. The Na(4)-O(4) bond length is 2.36 Å. The Na(4)-O(5) bond length is 2.33 Å. The Na(4)-O(6) bond length is 2.36 Å. In the fifth Na site, Na(5) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. The Na(5)-O(1) bond length is 2.81 Å. The Na(5)-O(5) bond length is 2.76 Å. The Na(5)-O(6) bond length is 2.69 Å. In the sixth Na site, Na(6) is bonded in a 3-coordinate geometry to one O(2), one O(3), one O(4), and one O(5) atom. The Na(6)-O(2) bond length is 2.67 Å. The Na(6)-O(3) bond length is 2.30 Å. The Na(6)-O(4) bond length is 3.01 Å. The Na(6)-O(5) bond length is 2.51 Å. In the seventh Na site, Na(7) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(6) atom. The Na(7)-O(2) bond length is 2.29 Å. The Na(7)-O(4) bond length is 2.71 Å. The Na(7)-O(6) bond length is 2.50 Å. Mg(1) is bonded in a 3-coordinate geometry to one O(1), one O(5), and one O(6) atom. The Mg(1)-O(1) bond length is 1.99 Å. The Mg(1)-O(5) bond length is 1.99 Å. The Mg(1)-O(6) bond length is 1.99 Å. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Nb(1)-O(1) bond length is 2.33 Å. The Nb(1)-O(2) bond length is 1.91 Å. The Nb(1)-O(3) bond length is 1.91 Å. The Nb(1)-O(4) bond length is 1.91 Å. The Nb(1)-O(5) bond length is 2.36 Å. The Nb(1)-O(6) bond length is 2.41 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(5), one Mg(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Na(6), one Na(7), and one Nb(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(6), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Na(6), one Na(7), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Na(2), one Na(4), one Na(5), one Na(6), one Mg(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(7), one Mg(1), and one Nb(1) atom.