LaTaON2 crystallizes in the monoclinic C2/m space group. La(1) is bonded in a 6-coordinate geometry to two equivalent N(2), four equivalent N(1), and two equivalent O(1) atoms. Ta(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent O(1) atoms to form corner-sharing TaN4O2 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. There are two inequivalent N sites. In the first N site, N(1) is bonded to four equivalent La(1) and two equivalent Ta(1) atoms to form a mixture of distorted corner and edge-sharing NLa4Ta2 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Ta(1) atoms. O(1) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Ta(1) atoms.
LaTaON2 crystallizes in the monoclinic C2/m space group. La(1) is bonded in a 6-coordinate geometry to two equivalent N(2), four equivalent N(1), and two equivalent O(1) atoms. There is one shorter (2.47 Å) and one longer (2.63 Å) La(1)-N(2) bond length. There are two shorter (2.71 Å) and two longer (2.97 Å) La(1)-N(1) bond lengths. Both La(1)-O(1) bond lengths are 2.60 Å. Ta(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent O(1) atoms to form corner-sharing TaN4O2 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. Both Ta(1)-N(1) bond lengths are 2.08 Å. Both Ta(1)-N(2) bond lengths are 2.08 Å. Both Ta(1)-O(1) bond lengths are 2.05 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to four equivalent La(1) and two equivalent Ta(1) atoms to form a mixture of distorted corner and edge-sharing NLa4Ta2 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Ta(1) atoms. O(1) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Ta(1) atoms.