Mg2Ta2SnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted edge-sharing SnO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Ta(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of edge and corner-sharing OMg3Ta trigonal pyramids.
Mg2Ta2SnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. There are a spread of Mg(1)-O(3) bond distances ranging from 2.04-2.49 Å. There are a spread of Mg(1)-O(4) bond distances ranging from 2.00-2.12 Å. Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The Ta(1)-O(2) bond length is 1.85 Å. The Ta(1)-O(4) bond length is 1.98 Å. There is one shorter (1.95 Å) and one longer (2.03 Å) Ta(1)-O(1) bond length. There is one shorter (2.07 Å) and one longer (2.40 Å) Ta(1)-O(3) bond length. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted edge-sharing SnO6 octahedra. Both Sn(1)-O(1) bond lengths are 2.54 Å. There are two shorter (2.42 Å) and two longer (2.49 Å) Sn(1)-O(2) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Ta(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of edge and corner-sharing OMg3Ta trigonal pyramids.