Na2MgGe2(SbO5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(6), one O(7), one O(8), and one O(9) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(6), and one O(9) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(10), one O(3), one O(4), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. In the second Ge site, Ge(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-52°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(9) atom. In the second Sb site, Sb(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded to one Na(2), one Mg(1), one Sb(1), and one Sb(2) atom to form distorted edge-sharing ONaMgSb2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Ge(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Ge(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(2), one Mg(1), one Ge(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Ge(2), and one Sb(2) atom to form distorted edge-sharing ONa2GeSb tetrahedra. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(1), one Ge(2), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Ge(1), and one Sb(1) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Na(2), one Ge(1), and one Sb(2) atom.
Na2MgGe2(SbO5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(6), one O(7), one O(8), and one O(9) atom. The Na(1)-O(1) bond length is 2.56 Å. The Na(1)-O(3) bond length is 2.47 Å. The Na(1)-O(6) bond length is 2.33 Å. The Na(1)-O(7) bond length is 2.54 Å. The Na(1)-O(8) bond length is 2.85 Å. The Na(1)-O(9) bond length is 2.80 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(6), and one O(9) atom. The Na(2)-O(10) bond length is 2.43 Å. The Na(2)-O(2) bond length is 2.46 Å. The Na(2)-O(4) bond length is 2.66 Å. The Na(2)-O(5) bond length is 2.74 Å. The Na(2)-O(6) bond length is 2.46 Å. The Na(2)-O(9) bond length is 2.31 Å. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. The Mg(1)-O(1) bond length is 2.25 Å. The Mg(1)-O(2) bond length is 2.01 Å. The Mg(1)-O(3) bond length is 2.10 Å. The Mg(1)-O(5) bond length is 2.04 Å. The Mg(1)-O(7) bond length is 1.94 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(10), one O(3), one O(4), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. The Ge(1)-O(10) bond length is 1.80 Å. The Ge(1)-O(3) bond length is 1.79 Å. The Ge(1)-O(4) bond length is 1.78 Å. The Ge(1)-O(9) bond length is 1.76 Å. In the second Ge site, Ge(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-52°. The Ge(2)-O(5) bond length is 1.78 Å. The Ge(2)-O(6) bond length is 1.82 Å. The Ge(2)-O(7) bond length is 1.72 Å. The Ge(2)-O(8) bond length is 1.79 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(9) atom. The Sb(1)-O(1) bond length is 2.13 Å. The Sb(1)-O(2) bond length is 2.37 Å. The Sb(1)-O(3) bond length is 2.14 Å. The Sb(1)-O(5) bond length is 2.26 Å. The Sb(1)-O(9) bond length is 2.23 Å. In the second Sb site, Sb(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. The Sb(2)-O(1) bond length is 2.02 Å. The Sb(2)-O(10) bond length is 2.03 Å. The Sb(2)-O(2) bond length is 1.96 Å. The Sb(2)-O(4) bond length is 2.04 Å. The Sb(2)-O(6) bond length is 2.05 Å. The Sb(2)-O(8) 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 Na(1), one Mg(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded to one Na(2), one Mg(1), one Sb(1), and one Sb(2) atom to form distorted edge-sharing ONaMgSb2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Ge(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Ge(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(2), one Mg(1), one Ge(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Ge(2), and one Sb(2) atom to form distorted edge-sharing ONa2GeSb tetrahedra. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(1), one Ge(2), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Ge(1), and one Sb(1) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Na(2), one Ge(1), and one Sb(2) atom.