GdTiCdSbO7 crystallizes in the orthorhombic Imma space group. Gd(1) is bonded to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms to form distorted GdO8 hexagonal bipyramids that share edges with two equivalent Gd(1)O8 hexagonal bipyramids, edges with four equivalent Cd(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Ti(1)O6 octahedra. Ti(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Cd(1)O8 hexagonal bipyramids, and edges with four equivalent Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 45°. Cd(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted CdO8 hexagonal bipyramids that share edges with two equivalent Cd(1)O8 hexagonal bipyramids, edges with four equivalent Gd(1)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra, edges with two equivalent Gd(1)O8 hexagonal bipyramids, and edges with four equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-47°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Gd(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to two equivalent Cd(1) and two equivalent Sb(1) atoms to form distorted OCd2Sb2 tetrahedra that share corners with two equivalent O(4)Gd2Cd2 tetrahedra, corners with four equivalent O(2)Cd2Sb2 tetrahedra, and  an edgeedge with one O(4)Gd2Cd2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Gd(1), one Ti(1), one Cd(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded to two equivalent Gd(1) and two equivalent Cd(1) atoms to form OGd2Cd2 tetrahedra that share corners with two equivalent O(2)Cd2Sb2 tetrahedra, corners with four equivalent O(4)Gd2Cd2 tetrahedra, and  an edgeedge with one O(2)Cd2Sb2 tetrahedra.
GdTiCdSbO7 crystallizes in the orthorhombic Imma space group. Gd(1) is bonded to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms to form distorted GdO8 hexagonal bipyramids that share edges with two equivalent Gd(1)O8 hexagonal bipyramids, edges with four equivalent Cd(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Ti(1)O6 octahedra. Both Gd(1)-O(1) bond lengths are 2.61 Å. Both Gd(1)-O(4) bond lengths are 2.27 Å. All Gd(1)-O(3) bond lengths are 2.52 Å. Ti(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Cd(1)O8 hexagonal bipyramids, and edges with four equivalent Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 45°. Both Ti(1)-O(1) bond lengths are 1.96 Å. All Ti(1)-O(3) bond lengths are 1.98 Å. Cd(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted CdO8 hexagonal bipyramids that share edges with two equivalent Cd(1)O8 hexagonal bipyramids, edges with four equivalent Gd(1)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. Both Cd(1)-O(2) bond lengths are 2.53 Å. Both Cd(1)-O(4) bond lengths are 2.22 Å. All Cd(1)-O(3) bond lengths are 2.67 Å. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra, edges with two equivalent Gd(1)O8 hexagonal bipyramids, and edges with four equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-47°. Both Sb(1)-O(2) bond lengths are 2.04 Å. All Sb(1)-O(3) bond lengths are 1.98 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Gd(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to two equivalent Cd(1) and two equivalent Sb(1) atoms to form distorted OCd2Sb2 tetrahedra that share corners with two equivalent O(4)Gd2Cd2 tetrahedra, corners with four equivalent O(2)Cd2Sb2 tetrahedra, and  an edgeedge with one O(4)Gd2Cd2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Gd(1), one Ti(1), one Cd(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded to two equivalent Gd(1) and two equivalent Cd(1) atoms to form OGd2Cd2 tetrahedra that share corners with two equivalent O(2)Cd2Sb2 tetrahedra, corners with four equivalent O(4)Gd2Cd2 tetrahedra, and  an edgeedge with one O(2)Cd2Sb2 tetrahedra.