Mg2Ta2VO8 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. V(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing VO6 octahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of corner and edge-sharing OMg3Ta trigonal pyramids. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one V(1) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent V(1) atoms. In the fourth O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms.
Mg2Ta2VO8 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 2.04-2.47 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 1.97 Å. There is one shorter (1.97 Å) and one longer (2.05 Å) Ta(1)-O(1) bond length. There is one shorter (2.05 Å) and one longer (2.36 Å) Ta(1)-O(3) bond length. V(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing VO6 octahedra. Both V(1)-O(1) bond lengths are 2.23 Å. All V(1)-O(2) bond lengths are 2.16 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of corner and edge-sharing OMg3Ta trigonal pyramids. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one V(1) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent V(1) atoms. In the fourth O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms.