Na2MgNd2Ti3O10 crystallizes in the tetragonal I-4m2 space group. Na(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. Nd(1) is bonded to two equivalent O(1), two equivalent O(2), four equivalent O(4), and four equivalent O(5) atoms to form NdO12 cuboctahedra that share corners with eight equivalent Nd(1)O12 cuboctahedra, faces with five equivalent Nd(1)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(3), one O(5), two equivalent O(1), and two 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 Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-16°. In the second Ti site, Ti(2) is bonded to two equivalent O(5) 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 Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Nd(1), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Nd(1), and two equivalent Ti(1) atoms to form a mixture of distorted corner and edge-sharing ONa2Nd2Ti2 octahedra. The corner-sharing octahedral tilt angles are 16°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mg(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Nd(1) and two equivalent Ti(2) atoms. In the fifth O site, O(5) is bonded in a distorted linear geometry to four equivalent Nd(1), one Ti(1), and one Ti(2) atom.
Na2MgNd2Ti3O10 crystallizes in the tetragonal I-4m2 space group. Na(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Na(1)-O(3) bond length is 2.46 Å. Both Na(1)-O(1) bond lengths are 2.33 Å. Both Na(1)-O(2) bond lengths are 2.44 Å. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. All Mg(1)-O(3) bond lengths are 2.13 Å. Nd(1) is bonded to two equivalent O(1), two equivalent O(2), four equivalent O(4), and four equivalent O(5) atoms to form NdO12 cuboctahedra that share corners with eight equivalent Nd(1)O12 cuboctahedra, faces with five equivalent Nd(1)O12 cuboctahedra, faces with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Ti(2)O6 octahedra. Both Nd(1)-O(1) bond lengths are 2.76 Å. Both Nd(1)-O(2) bond lengths are 2.62 Å. There are two shorter (2.77 Å) and two longer (2.79 Å) Nd(1)-O(4) bond lengths. All Nd(1)-O(5) bond lengths are 2.79 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(5), two equivalent O(1), and two 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 Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-16°. The Ti(1)-O(3) bond length is 2.04 Å. The Ti(1)-O(5) bond length is 2.00 Å. Both Ti(1)-O(1) bond lengths are 1.97 Å. Both Ti(1)-O(2) bond lengths are 1.99 Å. In the second Ti site, Ti(2) is bonded to two equivalent O(5) 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 Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. Both Ti(2)-O(5) bond lengths are 1.95 Å. All Ti(2)-O(4) bond lengths are 1.97 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Nd(1), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Nd(1), and two equivalent Ti(1) atoms to form a mixture of distorted corner and edge-sharing ONa2Nd2Ti2 octahedra. The corner-sharing octahedral tilt angles are 16°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mg(1), and one Ti(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to four equivalent Nd(1) and two equivalent Ti(2) atoms. In the fifth O site, O(5) is bonded in a distorted linear geometry to four equivalent Nd(1), one Ti(1), and one Ti(2) atom.