La2Ti2O5 crystallizes in the orthorhombic Imma space group. La(1) is bonded in a 10-coordinate geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 13°. In the second Ti site, Ti(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent La(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent La(1), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded to four equivalent La(1) and two equivalent Ti(2) atoms to form distorted face-sharing OLa4Ti2 octahedra.
La2Ti2O5 crystallizes in the orthorhombic Imma space group. La(1) is bonded in a 10-coordinate geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. Both La(1)-O(3) bond lengths are 2.76 Å. There are two shorter (2.64 Å) and two longer (2.98 Å) La(1)-O(1) bond lengths. There are a spread of La(1)-O(2) bond distances ranging from 2.53-3.06 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 13°. Both Ti(1)-O(2) bond lengths are 2.03 Å. All Ti(1)-O(1) bond lengths are 1.98 Å. In the second Ti site, Ti(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Ti(2)-O(2) bond lengths are 1.96 Å. Both Ti(2)-O(3) bond lengths are 2.04 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent La(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent La(1), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded to four equivalent La(1) and two equivalent Ti(2) atoms to form distorted face-sharing OLa4Ti2 octahedra.