Ba2MgLaTa(CuO4)2 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. La(1) is bonded in a 4-coordinate geometry to eight equivalent O(2) atoms. Ta(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. Cu(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Ta(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Mg(1), two equivalent La(1), and one Cu(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Ta(1) atom.
Ba2MgLaTa(CuO4)2 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. Both Ba(1)-O(2) bond lengths are 2.70 Å. Both Ba(1)-O(3) bond lengths are 2.97 Å. There is one shorter (2.62 Å) and two longer (3.13 Å) Ba(1)-O(1) bond lengths. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. All Mg(1)-O(2) bond lengths are 2.07 Å. La(1) is bonded in a 4-coordinate geometry to eight equivalent O(2) atoms. There are four shorter (2.41 Å) and four longer (2.92 Å) La(1)-O(2) bond lengths. Ta(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Ta(1)-O(1) bond lengths are 1.93 Å. Both Ta(1)-O(3) bond lengths are 1.87 Å. Cu(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. The Cu(1)-O(1) bond length is 1.95 Å. Both Cu(1)-O(2) bond lengths are 1.97 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Ta(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Mg(1), two equivalent La(1), and one Cu(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Ta(1) atom.