La2Ti3(AgO5)2 crystallizes in the tetragonal I4/mmm space group. La(1) is bonded to four equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms to form distorted LaO12 cuboctahedra that share corners with eight equivalent La(1)O12 cuboctahedra, faces with five equivalent La(1)O12 cuboctahedra, and faces with four equivalent Ti(2)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), and four equivalent O(2) atoms. In the second Ti site, Ti(2) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent La(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Ag(1) is bonded to five equivalent O(1) atoms to form a mixture of distorted edge and corner-sharing AgO5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ti(1) and five equivalent Ag(1) atoms. In the second O site, O(2) is bonded to two equivalent La(1) and two equivalent Ti(1) atoms to form distorted OLa2Ti2 trigonal pyramids that share corners with four equivalent O(3)La4Ti2 octahedra, corners with four equivalent O(2)La2Ti2 trigonal pyramids, edges with four equivalent O(2)La2Ti2 trigonal pyramids, and faces with two equivalent O(3)La4Ti2 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third O site, O(3) is bonded to four equivalent La(1), one Ti(1), and one Ti(2) atom to form distorted OLa4Ti2 octahedra that share corners with five equivalent O(3)La4Ti2 octahedra, corners with eight equivalent O(2)La2Ti2 trigonal pyramids, edges with four equivalent O(3)La4Ti2 octahedra, and faces with four equivalent O(2)La2Ti2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 0-9°. In the fourth O site, O(4) is bonded in a linear geometry to four equivalent La(1) and two equivalent Ti(2) atoms.
La2Ti3(AgO5)2 crystallizes in the tetragonal I4/mmm space group. La(1) is bonded to four equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms to form distorted LaO12 cuboctahedra that share corners with eight equivalent La(1)O12 cuboctahedra, faces with five equivalent La(1)O12 cuboctahedra, and faces with four equivalent Ti(2)O6 octahedra. All La(1)-O(2) bond lengths are 2.54 Å. All La(1)-O(3) bond lengths are 2.74 Å. All La(1)-O(4) bond lengths are 2.91 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), and four equivalent O(2) atoms. The Ti(1)-O(1) bond length is 1.78 Å. The Ti(1)-O(3) bond length is 2.32 Å. All Ti(1)-O(2) bond lengths are 1.98 Å. In the second Ti site, Ti(2) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent La(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Ti(2)-O(3) bond lengths are 1.95 Å. All Ti(2)-O(4) bond lengths are 1.93 Å. Ag(1) is bonded to five equivalent O(1) atoms to form a mixture of distorted edge and corner-sharing AgO5 square pyramids. There is one shorter (2.30 Å) and four longer (2.74 Å) Ag(1)-O(1) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ti(1) and five equivalent Ag(1) atoms. In the second O site, O(2) is bonded to two equivalent La(1) and two equivalent Ti(1) atoms to form distorted OLa2Ti2 trigonal pyramids that share corners with four equivalent O(3)La4Ti2 octahedra, corners with four equivalent O(2)La2Ti2 trigonal pyramids, edges with four equivalent O(2)La2Ti2 trigonal pyramids, and faces with two equivalent O(3)La4Ti2 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third O site, O(3) is bonded to four equivalent La(1), one Ti(1), and one Ti(2) atom to form distorted OLa4Ti2 octahedra that share corners with five equivalent O(3)La4Ti2 octahedra, corners with eight equivalent O(2)La2Ti2 trigonal pyramids, edges with four equivalent O(3)La4Ti2 octahedra, and faces with four equivalent O(2)La2Ti2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 0-9°. In the fourth O site, O(4) is bonded in a linear geometry to four equivalent La(1) and two equivalent Ti(2) atoms.