Sm2BaZnO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted SmO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. Zn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with five equivalent Sm(1)O7 pentagonal bipyramids and  an edgeedge with one Sm(1)O7 pentagonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Sm(1), one Sm(2), and one Zn(1) atom to form a mixture of distorted corner and edge-sharing OBa3Sm2Zn octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one Sm(1), two equivalent Sm(2), and one Zn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Sm(2), two equivalent Sm(1), and one Zn(1) atom.
Sm2BaZnO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. There is one shorter (2.73 Å) and two longer (2.93 Å) Ba(1)-O(1) bond lengths. There are two shorter (2.94 Å) and two longer (3.13 Å) Ba(1)-O(2) bond lengths. There are two shorter (3.16 Å) and two longer (3.37 Å) Ba(1)-O(3) bond lengths. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted SmO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The Sm(1)-O(1) bond length is 2.42 Å. Both Sm(1)-O(2) bond lengths are 2.43 Å. There are two shorter (2.37 Å) and two longer (2.42 Å) Sm(1)-O(3) bond lengths. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. The Sm(2)-O(1) bond length is 2.48 Å. Both Sm(2)-O(3) bond lengths are 2.37 Å. There are two shorter (2.42 Å) and two longer (2.43 Å) Sm(2)-O(2) bond lengths. Zn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with five equivalent Sm(1)O7 pentagonal bipyramids and  an edgeedge with one Sm(1)O7 pentagonal bipyramid. The Zn(1)-O(1) bond length is 2.01 Å. Both Zn(1)-O(2) bond lengths are 2.18 Å. Both Zn(1)-O(3) bond lengths are 2.07 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Sm(1), one Sm(2), and one Zn(1) atom to form a mixture of distorted corner and edge-sharing OBa3Sm2Zn octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one Sm(1), two equivalent Sm(2), and one Zn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Sm(2), two equivalent Sm(1), and one Zn(1) atom.