Eu4Ti3O10 is (Cubic) Perovskite-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded to four equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms to form EuO12 cuboctahedra that share corners with eight equivalent Eu(2)O12 cuboctahedra, faces with five equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Ti(2)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. 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 two equivalent Ti(1)O6 octahedra, corners with four equivalent Ti(2)O6 octahedra, and faces with eight equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded to five equivalent Eu(1) and one Ti(1) atom to form distorted OEu5Ti octahedra that share corners with four equivalent O(1)Eu5Ti octahedra, corners with twelve equivalent O(2)Eu4Ti2 octahedra, edges with eight equivalent O(1)Eu5Ti octahedra, and faces with four equivalent O(2)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 12-53°. In the second O site, O(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Ti(1) atoms to form distorted OEu4Ti2 octahedra that share corners with two equivalent O(2)Eu4Ti2 octahedra, corners with six equivalent O(1)Eu5Ti octahedra, edges with two equivalent O(2)Eu4Ti2 octahedra, faces with two equivalent O(1)Eu5Ti octahedra, and faces with four equivalent O(2)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Eu(2), one Ti(1), and one Ti(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Eu(2) and two equivalent Ti(2) atoms.
Eu4Ti3O10 is (Cubic) Perovskite-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. All Eu(1)-O(2) bond lengths are 2.62 Å. There is one shorter (2.41 Å) and four longer (2.80 Å) Eu(1)-O(1) bond lengths. In the second Eu site, Eu(2) is bonded to four equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms to form EuO12 cuboctahedra that share corners with eight equivalent Eu(2)O12 cuboctahedra, faces with five equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Ti(2)O6 octahedra. All Eu(2)-O(2) bond lengths are 2.81 Å. All Eu(2)-O(3) bond lengths are 2.79 Å. All Eu(2)-O(4) bond lengths are 2.74 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Ti(1)-O(1) bond length is 1.99 Å. The Ti(1)-O(3) bond length is 1.98 Å. All Ti(1)-O(2) bond lengths are 1.97 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 two equivalent Ti(1)O6 octahedra, corners with four equivalent Ti(2)O6 octahedra, and faces with eight equivalent Eu(2)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 1.97 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to five equivalent Eu(1) and one Ti(1) atom to form distorted OEu5Ti octahedra that share corners with four equivalent O(1)Eu5Ti octahedra, corners with twelve equivalent O(2)Eu4Ti2 octahedra, edges with eight equivalent O(1)Eu5Ti octahedra, and faces with four equivalent O(2)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 12-53°. In the second O site, O(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Ti(1) atoms to form distorted OEu4Ti2 octahedra that share corners with two equivalent O(2)Eu4Ti2 octahedra, corners with six equivalent O(1)Eu5Ti octahedra, edges with two equivalent O(2)Eu4Ti2 octahedra, faces with two equivalent O(1)Eu5Ti octahedra, and faces with four equivalent O(2)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Eu(2), one Ti(1), and one Ti(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Eu(2) and two equivalent Ti(2) atoms.