BaSm2CoO5 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. Sm(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 Sm(1), and one Co(1) atom to form distorted OBa2Sm3Co octahedra that share corners with three equivalent O(2)Ba2Sm2Co2 octahedra, corners with thirteen equivalent O(1)Ba2Sm3Co octahedra, edges with five equivalent O(1)Ba2Sm3Co octahedra, faces with two equivalent O(2)Ba2Sm2Co2 octahedra, and faces with three equivalent O(1)Ba2Sm3Co octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Sm(1), and two equivalent Co(1) atoms to form distorted OBa2Sm2Co2 octahedra that share corners with four equivalent O(2)Ba2Sm2Co2 octahedra, corners with twelve equivalent O(1)Ba2Sm3Co octahedra, and faces with eight equivalent O(1)Ba2Sm3Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.
BaSm2CoO5 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 2.97 Å. All Ba(1)-O(1) bond lengths are 3.01 Å. Sm(1) is bonded in a 7-coordinate geometry to one O(2) and six equivalent O(1) atoms. The Sm(1)-O(2) bond length is 2.40 Å. There are two shorter (2.33 Å) and four longer (2.48 Å) Sm(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 1.91 Å. All Co(1)-O(1) bond lengths are 2.27 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), three equivalent Sm(1), and one Co(1) atom to form distorted OBa2Sm3Co octahedra that share corners with three equivalent O(2)Ba2Sm2Co2 octahedra, corners with thirteen equivalent O(1)Ba2Sm3Co octahedra, edges with five equivalent O(1)Ba2Sm3Co octahedra, faces with two equivalent O(2)Ba2Sm2Co2 octahedra, and faces with three equivalent O(1)Ba2Sm3Co octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Sm(1), and two equivalent Co(1) atoms to form distorted OBa2Sm2Co2 octahedra that share corners with four equivalent O(2)Ba2Sm2Co2 octahedra, corners with twelve equivalent O(1)Ba2Sm3Co octahedra, and faces with eight equivalent O(1)Ba2Sm3Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.