LuTa3O9 crystallizes in the monoclinic P2_1/m space group. Lu(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(2), and four equivalent O(3) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 36-53°. In the second Ta site, Ta(2) is bonded to one O(2), one O(4), one O(5), one O(6), and two equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 36-53°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Lu(1), one Ta(1), and one Ta(2) atom. In the third O site, O(3) is bonded to two equivalent Lu(1) and two equivalent Ta(2) atoms to form a mixture of distorted edge and corner-sharing OLu2Ta2 trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Lu(1) and two equivalent Ta(2) atoms. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Lu(1) and two equivalent Ta(2) atoms.
LuTa3O9 crystallizes in the monoclinic P2_1/m space group. Lu(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(2), and four equivalent O(3) atoms. The Lu(1)-O(4) bond length is 2.26 Å. The Lu(1)-O(6) bond length is 2.24 Å. Both Lu(1)-O(2) bond lengths are 2.37 Å. There are two shorter (2.28 Å) and two longer (2.49 Å) Lu(1)-O(3) bond lengths. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 36-53°. Both Ta(1)-O(1) bond lengths are 1.94 Å. Both Ta(1)-O(2) bond lengths are 2.03 Å. Both Ta(1)-O(5) bond lengths are 1.98 Å. In the second Ta site, Ta(2) is bonded to one O(2), one O(4), one O(5), one O(6), and two equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 36-53°. The Ta(2)-O(2) bond length is 1.95 Å. The Ta(2)-O(4) bond length is 1.98 Å. The Ta(2)-O(5) bond length is 1.84 Å. The Ta(2)-O(6) bond length is 2.00 Å. There is one shorter (2.02 Å) and one longer (2.19 Å) Ta(2)-O(3) bond length. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Lu(1), one Ta(1), and one Ta(2) atom. In the third O site, O(3) is bonded to two equivalent Lu(1) and two equivalent Ta(2) atoms to form a mixture of distorted edge and corner-sharing OLu2Ta2 trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Lu(1) and two equivalent Ta(2) atoms. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Lu(1) and two equivalent Ta(2) atoms.