FeZnBiO5 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Bi(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. Zn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted BiO6 octahedra that share  a cornercorner with one Fe(1)O5 trigonal bipyramid,  an edgeedge with one Bi(1)O6 octahedra, and edges with two equivalent Fe(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Fe(1), one Zn(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Fe(1), one Zn(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Zn(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded to two equivalent Zn(1) and two equivalent Bi(1) atoms to form edge-sharing OZn2Bi2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one Zn(1), and one Bi(1) atom.
FeZnBiO5 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Bi(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. The Fe(1)-O(2) bond length is 1.95 Å. The Fe(1)-O(3) bond length is 2.00 Å. The Fe(1)-O(5) bond length is 1.93 Å. There is one shorter (1.94 Å) and one longer (2.17 Å) Fe(1)-O(1) bond length. Zn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms. The Zn(1)-O(1) bond length is 2.51 Å. The Zn(1)-O(2) bond length is 2.05 Å. The Zn(1)-O(3) bond length is 1.99 Å. The Zn(1)-O(5) bond length is 2.02 Å. There is one shorter (2.12 Å) and one longer (2.33 Å) Zn(1)-O(4) bond length. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted BiO6 octahedra that share  a cornercorner with one Fe(1)O5 trigonal bipyramid,  an edgeedge with one Bi(1)O6 octahedra, and edges with two equivalent Fe(1)O5 trigonal bipyramids. The Bi(1)-O(1) bond length is 2.16 Å. The Bi(1)-O(2) bond length is 2.16 Å. The Bi(1)-O(3) bond length is 2.11 Å. The Bi(1)-O(5) bond length is 2.16 Å. There is one shorter (2.19 Å) and one longer (2.20 Å) Bi(1)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Fe(1), one Zn(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Fe(1), one Zn(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Zn(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded to two equivalent Zn(1) and two equivalent Bi(1) atoms to form edge-sharing OZn2Bi2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one Zn(1), and one Bi(1) atom.