BaGd2CoO5 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a distorted q6 geometry to two equivalent O(2) and eight equivalent O(1) atoms. Gd(1) is bonded in a 7-coordinate geometry to one O(2) and six equivalent O(1) atoms. Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), three equivalent Gd(1), and one Co(1) atom to form distorted OBa2Gd3Co octahedra that share corners with three equivalent O(2)Ba2Gd2Co2 octahedra, corners with thirteen equivalent O(1)Ba2Gd3Co octahedra, edges with five equivalent O(1)Ba2Gd3Co octahedra, faces with two equivalent O(2)Ba2Gd2Co2 octahedra, and faces with three equivalent O(1)Ba2Gd3Co octahedra. The corner-sharing octahedral tilt angles range from 0-70°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Co(1) atoms to form distorted OBa2Gd2Co2 octahedra that share corners with four equivalent O(2)Ba2Gd2Co2 octahedra, corners with twelve equivalent O(1)Ba2Gd3Co octahedra, and faces with eight equivalent O(1)Ba2Gd3Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.
BaGd2CoO5 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a distorted q6 geometry to two equivalent O(2) and eight equivalent O(1) atoms. Both Ba(1)-O(2) bond lengths are 2.94 Å. All Ba(1)-O(1) bond lengths are 2.97 Å. Gd(1) is bonded in a 7-coordinate geometry to one O(2) and six equivalent O(1) atoms. The Gd(1)-O(2) bond length is 2.35 Å. There are two shorter (2.31 Å) and four longer (2.45 Å) Gd(1)-O(1) bond lengths. Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. Both Co(1)-O(2) bond lengths are 1.89 Å. All Co(1)-O(1) bond lengths are 2.22 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), three equivalent Gd(1), and one Co(1) atom to form distorted OBa2Gd3Co octahedra that share corners with three equivalent O(2)Ba2Gd2Co2 octahedra, corners with thirteen equivalent O(1)Ba2Gd3Co octahedra, edges with five equivalent O(1)Ba2Gd3Co octahedra, faces with two equivalent O(2)Ba2Gd2Co2 octahedra, and faces with three equivalent O(1)Ba2Gd3Co octahedra. The corner-sharing octahedral tilt angles range from 0-70°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Co(1) atoms to form distorted OBa2Gd2Co2 octahedra that share corners with four equivalent O(2)Ba2Gd2Co2 octahedra, corners with twelve equivalent O(1)Ba2Gd3Co octahedra, and faces with eight equivalent O(1)Ba2Gd3Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.