Dy2MoFeO7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Dy site, Dy(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. In the third Dy site, Dy(3) is bonded to two equivalent O(5) and four equivalent O(4) atoms to form distorted DyO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form MoO6 octahedra that share corners with two equivalent Dy(3)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Mo(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-60°. In the second Mo site, Mo(2) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form MoO8 hexagonal bipyramids that share edges with two equivalent Mo(1)O6 octahedra and edges with four equivalent Fe(1)O6 octahedra. Fe(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Dy(3)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Mo(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Dy(2), two equivalent Dy(1), and one Mo(2) atom to form ODy3Mo tetrahedra that share corners with two equivalent O(5)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(5)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids. In the second O site, O(2) is bonded to one Dy(1), one Mo(1), one Mo(2), and one Fe(1) atom to form distorted ODyFeMo2 trigonal pyramids that share corners with two equivalent O(4)Dy3Fe tetrahedra, corners with two equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(5)Dy3Mo tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with six equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(4)Dy3Fe tetrahedra,  an edgeedge with one O(1)Dy3Mo tetrahedra,  an edgeedge with one O(5)Dy3Mo tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and  an edgeedge with one O(2)DyFeMo2 trigonal pyramid. In the third O site, O(3) is bonded to one Dy(2), one Mo(2), and two equivalent Fe(1) atoms to form distorted ODyFe2Mo trigonal pyramids that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(3)DyFe2Mo trigonal pyramids, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(1)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Dy(1), one Dy(2), one Dy(3), and one Fe(1) atom to form ODy3Fe tetrahedra that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(5)Dy3Mo tetrahedra, corners with six equivalent O(4)Dy3Fe tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with two equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(4)Dy3Fe tetrahedra,  an edgeedge with one O(1)Dy3Mo tetrahedra,  an edgeedge with one O(5)Dy3Mo tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and  an edgeedge with one O(2)DyFeMo2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Dy(3), two equivalent Dy(1), and one Mo(1) atom to form ODy3Mo tetrahedra that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(5)Dy3Mo tetrahedra, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(1)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids.
Dy2MoFeO7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Both Dy(1)-O(1) bond lengths are 2.27 Å. Both Dy(1)-O(2) bond lengths are 2.65 Å. Both Dy(1)-O(4) bond lengths are 2.36 Å. Both Dy(1)-O(5) bond lengths are 2.38 Å. In the second Dy site, Dy(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. Both Dy(2)-O(1) bond lengths are 2.32 Å. Both Dy(2)-O(3) bond lengths are 2.62 Å. All Dy(2)-O(4) bond lengths are 2.37 Å. In the third Dy site, Dy(3) is bonded to two equivalent O(5) and four equivalent O(4) atoms to form distorted DyO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. Both Dy(3)-O(5) bond lengths are 2.24 Å. All Dy(3)-O(4) bond lengths are 2.23 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form MoO6 octahedra that share corners with two equivalent Dy(3)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with two equivalent Mo(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-60°. Both Mo(1)-O(5) bond lengths are 1.97 Å. All Mo(1)-O(2) bond lengths are 2.00 Å. In the second Mo site, Mo(2) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form MoO8 hexagonal bipyramids that share edges with two equivalent Mo(1)O6 octahedra and edges with four equivalent Fe(1)O6 octahedra. Both Mo(2)-O(1) bond lengths are 2.07 Å. Both Mo(2)-O(3) bond lengths are 2.35 Å. All Mo(2)-O(2) bond lengths are 2.37 Å. Fe(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Dy(3)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Mo(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. Both Fe(1)-O(2) bond lengths are 2.05 Å. Both Fe(1)-O(3) bond lengths are 2.03 Å. Both Fe(1)-O(4) bond lengths are 1.99 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Dy(2), two equivalent Dy(1), and one Mo(2) atom to form ODy3Mo tetrahedra that share corners with two equivalent O(5)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(5)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids. In the second O site, O(2) is bonded to one Dy(1), one Mo(1), one Mo(2), and one Fe(1) atom to form distorted ODyFeMo2 trigonal pyramids that share corners with two equivalent O(4)Dy3Fe tetrahedra, corners with two equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(5)Dy3Mo tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with six equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(4)Dy3Fe tetrahedra,  an edgeedge with one O(1)Dy3Mo tetrahedra,  an edgeedge with one O(5)Dy3Mo tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and  an edgeedge with one O(2)DyFeMo2 trigonal pyramid. In the third O site, O(3) is bonded to one Dy(2), one Mo(2), and two equivalent Fe(1) atoms to form distorted ODyFe2Mo trigonal pyramids that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(3)DyFe2Mo trigonal pyramids, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(1)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Dy(1), one Dy(2), one Dy(3), and one Fe(1) atom to form ODy3Fe tetrahedra that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with two equivalent O(5)Dy3Mo tetrahedra, corners with six equivalent O(4)Dy3Fe tetrahedra, corners with two equivalent O(3)DyFe2Mo trigonal pyramids, corners with two equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(4)Dy3Fe tetrahedra,  an edgeedge with one O(1)Dy3Mo tetrahedra,  an edgeedge with one O(5)Dy3Mo tetrahedra,  an edgeedge with one O(3)DyFe2Mo trigonal pyramid, and  an edgeedge with one O(2)DyFeMo2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Dy(3), two equivalent Dy(1), and one Mo(1) atom to form ODy3Mo tetrahedra that share corners with two equivalent O(1)Dy3Mo tetrahedra, corners with four equivalent O(4)Dy3Fe tetrahedra, corners with four equivalent O(5)Dy3Mo tetrahedra, corners with four equivalent O(2)DyFeMo2 trigonal pyramids,  an edgeedge with one O(1)Dy3Mo tetrahedra, edges with two equivalent O(4)Dy3Fe tetrahedra, and edges with two equivalent O(2)DyFeMo2 trigonal pyramids.