Na2Nd2Ti3O10 crystallizes in the tetragonal I4/mmm space group. Na(1) is bonded to five equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing NaO5 square pyramids. Nd(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(4) atoms to form distorted NdO12 cuboctahedra that share corners with eight equivalent Nd(1)O12 cuboctahedra, faces with five equivalent Nd(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(2), one O(4), and four equivalent O(1) atoms. In the second Ti site, Ti(2) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Nd(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to five equivalent Na(1) and one Ti(1) atom to form distorted ONa5Ti octahedra that share  a cornercorner with one O(4)Nd4Ti2 octahedra, corners with four equivalent O(2)Na5Ti octahedra, and edges with eight equivalent O(2)Na5Ti octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded in a linear geometry to four equivalent Nd(1) and two equivalent Ti(2) atoms. In the fourth O site, O(4) is bonded to four equivalent Nd(1), one Ti(1), and one Ti(2) atom to form distorted ONd4Ti2 octahedra that share  a cornercorner with one O(2)Na5Ti octahedra, corners with five equivalent O(4)Nd4Ti2 octahedra, and edges with four equivalent O(4)Nd4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°.
Na2Nd2Ti3O10 crystallizes in the tetragonal I4/mmm space group. Na(1) is bonded to five equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing NaO5 square pyramids. There is one shorter (2.30 Å) and four longer (2.73 Å) Na(1)-O(2) bond lengths. Nd(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(4) atoms to form distorted NdO12 cuboctahedra that share corners with eight equivalent Nd(1)O12 cuboctahedra, faces with five equivalent Nd(1)O12 cuboctahedra, and faces with four equivalent Ti(2)O6 octahedra. All Nd(1)-O(1) bond lengths are 2.52 Å. All Nd(1)-O(3) bond lengths are 2.90 Å. All Nd(1)-O(4) bond lengths are 2.73 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), and four equivalent O(1) atoms. The Ti(1)-O(2) bond length is 1.76 Å. The Ti(1)-O(4) bond length is 2.28 Å. All Ti(1)-O(1) bond lengths are 1.97 Å. In the second Ti site, Ti(2) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Ti(2)-O(4) bond lengths are 1.94 Å. All Ti(2)-O(3) bond lengths are 1.93 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Nd(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to five equivalent Na(1) and one Ti(1) atom to form distorted ONa5Ti octahedra that share  a cornercorner with one O(4)Nd4Ti2 octahedra, corners with four equivalent O(2)Na5Ti octahedra, and edges with eight equivalent O(2)Na5Ti octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded in a linear geometry to four equivalent Nd(1) and two equivalent Ti(2) atoms. In the fourth O site, O(4) is bonded to four equivalent Nd(1), one Ti(1), and one Ti(2) atom to form distorted ONd4Ti2 octahedra that share  a cornercorner with one O(2)Na5Ti octahedra, corners with five equivalent O(4)Nd4Ti2 octahedra, and edges with four equivalent O(4)Nd4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°.