Ta2O5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the second Ta site, Ta(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(2) and two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ta(2) atoms.
Ta2O5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. Both Ta(1)-O(1) bond lengths are 1.95 Å. All Ta(1)-O(2) bond lengths are 2.19 Å. In the second Ta site, Ta(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. Both Ta(2)-O(2) bond lengths are 2.09 Å. Both Ta(2)-O(3) bond lengths are 1.95 Å. Both Ta(2)-O(4) bond lengths are 1.85 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(2) and two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ta(2) atoms.