LaTaFeZnO6 crystallizes in the monoclinic Pc space group. La(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. Ta(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted TaO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 29-47°. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form FeO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 29-47°. Zn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ZnO4 trigonal pyramids that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-70°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one Ta(1), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Fe(1) atom.
LaTaFeZnO6 crystallizes in the monoclinic Pc space group. La(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. The La(1)-O(1) bond length is 2.52 Å. The La(1)-O(4) bond length is 2.38 Å. The La(1)-O(5) bond length is 2.40 Å. The La(1)-O(6) bond length is 2.42 Å. There is one shorter (2.58 Å) and one longer (2.84 Å) La(1)-O(2) bond length. There is one shorter (2.60 Å) and one longer (2.80 Å) La(1)-O(3) bond length. Ta(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted TaO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 29-47°. The Ta(1)-O(1) bond length is 2.04 Å. The Ta(1)-O(2) bond length is 2.09 Å. The Ta(1)-O(3) bond length is 2.28 Å. The Ta(1)-O(4) bond length is 1.98 Å. The Ta(1)-O(5) bond length is 1.92 Å. The Ta(1)-O(6) bond length is 1.89 Å. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form FeO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 29-47°. The Fe(1)-O(1) bond length is 2.21 Å. The Fe(1)-O(2) bond length is 2.44 Å. The Fe(1)-O(3) bond length is 2.15 Å. The Fe(1)-O(4) bond length is 2.19 Å. The Fe(1)-O(5) bond length is 2.07 Å. The Fe(1)-O(6) bond length is 2.13 Å. Zn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ZnO4 trigonal pyramids that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-70°. The Zn(1)-O(1) bond length is 1.96 Å. The Zn(1)-O(2) bond length is 2.00 Å. The Zn(1)-O(3) bond length is 1.99 Å. The Zn(1)-O(4) bond length is 2.29 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one La(1), one Ta(1), one Fe(1), and one Zn(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one Ta(1), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Fe(1) atom.