Ba2Mg(WO4)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(2), one O(5), two equivalent O(6), and two equivalent O(7) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(8) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. In the second W site, W(2) is bonded to one O(1), one O(2), one O(5), one O(8), and two equivalent O(3) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent W(2) atoms. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1) and two equivalent W(1) atoms. In the fifth O site, O(5) is bonded to one Ba(2), two equivalent Ba(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the sixth O site, O(6) is bonded to one Ba(1), two equivalent Ba(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), two equivalent Ba(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one W(1), and one W(2) atom.
Ba2Mg(WO4)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(2), and two equivalent O(5) atoms. The Ba(1)-O(6) bond length is 2.71 Å. The Ba(1)-O(7) bond length is 2.68 Å. Both Ba(1)-O(2) bond lengths are 2.72 Å. Both Ba(1)-O(5) bond lengths are 2.64 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(2), one O(5), two equivalent O(6), and two equivalent O(7) atoms. The Ba(2)-O(2) bond length is 2.72 Å. The Ba(2)-O(5) bond length is 2.67 Å. Both Ba(2)-O(6) bond lengths are 2.71 Å. Both Ba(2)-O(7) bond lengths are 2.65 Å. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(8) atoms. The Mg(1)-O(3) bond length is 1.97 Å. The Mg(1)-O(4) bond length is 1.97 Å. Both Mg(1)-O(8) bond lengths are 2.05 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(6), one O(7), one O(8), and two equivalent O(4) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. The W(1)-O(1) bond length is 1.99 Å. The W(1)-O(6) bond length is 1.91 Å. The W(1)-O(7) bond length is 1.96 Å. The W(1)-O(8) bond length is 2.26 Å. Both W(1)-O(4) bond lengths are 2.07 Å. In the second W site, W(2) is bonded to one O(1), one O(2), one O(5), one O(8), and two equivalent O(3) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. The W(2)-O(1) bond length is 1.99 Å. The W(2)-O(2) bond length is 1.91 Å. The W(2)-O(5) bond length is 1.96 Å. The W(2)-O(8) bond length is 2.26 Å. Both W(2)-O(3) bond lengths are 2.07 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded to one Ba(2), two equivalent Ba(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent W(2) atoms. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1) and two equivalent W(1) atoms. In the fifth O site, O(5) is bonded to one Ba(2), two equivalent Ba(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the sixth O site, O(6) is bonded to one Ba(1), two equivalent Ba(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), two equivalent Ba(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OBa3W tetrahedra. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one W(1), and one W(2) atom.