GdSrCoO4 is (La,Ba)CuO4-derived structured and crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent O(2), and four equivalent O(3) atoms. Gd(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. Co(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), three equivalent Gd(1), and one Co(1) atom to form distorted OSr2Gd3Co octahedra that share  a cornercorner with one O(2)Sr3Gd2Co octahedra, corners with four equivalent O(1)Sr2Gd3Co octahedra, corners with twelve equivalent O(3)Sr2Gd2Co2 octahedra, edges with two equivalent O(1)Sr2Gd3Co octahedra, edges with six equivalent O(2)Sr3Gd2Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. In the second O site, O(2) is bonded to three equivalent Sr(1), two equivalent Gd(1), and one Co(1) atom to form distorted OSr3Gd2Co octahedra that share  a cornercorner with one O(1)Sr2Gd3Co octahedra, corners with four equivalent O(2)Sr3Gd2Co octahedra, corners with twelve equivalent O(3)Sr2Gd2Co2 octahedra, edges with two equivalent O(2)Sr3Gd2Co octahedra, edges with six equivalent O(1)Sr2Gd3Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Gd(1), and two equivalent Co(1) atoms to form distorted OSr2Gd2Co2 octahedra that share corners with two equivalent O(3)Sr2Gd2Co2 octahedra, corners with six equivalent O(1)Sr2Gd3Co octahedra, corners with six equivalent O(2)Sr3Gd2Co octahedra, edges with two equivalent O(3)Sr2Gd2Co2 octahedra, faces with two equivalent O(1)Sr2Gd3Co octahedra, faces with two equivalent O(2)Sr3Gd2Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-56°.
GdSrCoO4 is (La,Ba)CuO4-derived structured and crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent O(2), and four equivalent O(3) atoms. Both Sr(1)-O(1) bond lengths are 2.70 Å. There is one shorter (2.39 Å) and two longer (2.69 Å) Sr(1)-O(2) bond lengths. All Sr(1)-O(3) bond lengths are 2.59 Å. Gd(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. Both Gd(1)-O(2) bond lengths are 2.69 Å. There is one shorter (2.29 Å) and two longer (2.74 Å) Gd(1)-O(1) bond lengths. All Gd(1)-O(3) bond lengths are 2.50 Å. Co(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. The Co(1)-O(1) bond length is 2.13 Å. The Co(1)-O(2) bond length is 1.91 Å. All Co(1)-O(3) bond lengths are 1.90 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), three equivalent Gd(1), and one Co(1) atom to form distorted OSr2Gd3Co octahedra that share  a cornercorner with one O(2)Sr3Gd2Co octahedra, corners with four equivalent O(1)Sr2Gd3Co octahedra, corners with twelve equivalent O(3)Sr2Gd2Co2 octahedra, edges with two equivalent O(1)Sr2Gd3Co octahedra, edges with six equivalent O(2)Sr3Gd2Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. In the second O site, O(2) is bonded to three equivalent Sr(1), two equivalent Gd(1), and one Co(1) atom to form distorted OSr3Gd2Co octahedra that share  a cornercorner with one O(1)Sr2Gd3Co octahedra, corners with four equivalent O(2)Sr3Gd2Co octahedra, corners with twelve equivalent O(3)Sr2Gd2Co2 octahedra, edges with two equivalent O(2)Sr3Gd2Co octahedra, edges with six equivalent O(1)Sr2Gd3Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Gd(1), and two equivalent Co(1) atoms to form distorted OSr2Gd2Co2 octahedra that share corners with two equivalent O(3)Sr2Gd2Co2 octahedra, corners with six equivalent O(1)Sr2Gd3Co octahedra, corners with six equivalent O(2)Sr3Gd2Co octahedra, edges with two equivalent O(3)Sr2Gd2Co2 octahedra, faces with two equivalent O(1)Sr2Gd3Co octahedra, faces with two equivalent O(2)Sr3Gd2Co octahedra, and faces with four equivalent O(3)Sr2Gd2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-56°.