DyNbO4 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded to one O(1), one O(2), one O(4), and three equivalent O(3) atoms to form distorted DyO6 octahedra that share corners with two equivalent Dy(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, edges with two equivalent Dy(1)O6 octahedra, and edges with three equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-47°. Nb(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted NbO6 octahedra that share corners with two equivalent Dy(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  an edgeedge with one Nb(1)O6 octahedra, and edges with three equivalent Dy(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-31°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Dy(1) and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a linear geometry to one Dy(1) and one Nb(1) atom. In the third O site, O(3) is bonded to three equivalent Dy(1) and one Nb(1) atom to form a mixture of corner and edge-sharing ODy3Nb tetrahedra. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Dy(1) and two equivalent Nb(1) atoms.
DyNbO4 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded to one O(1), one O(2), one O(4), and three equivalent O(3) atoms to form distorted DyO6 octahedra that share corners with two equivalent Dy(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, edges with two equivalent Dy(1)O6 octahedra, and edges with three equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-47°. The Dy(1)-O(1) bond length is 2.23 Å. The Dy(1)-O(2) bond length is 2.20 Å. The Dy(1)-O(4) bond length is 2.45 Å. There are two shorter (2.19 Å) and one longer (2.44 Å) Dy(1)-O(3) bond length. Nb(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted NbO6 octahedra that share corners with two equivalent Dy(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  an edgeedge with one Nb(1)O6 octahedra, and edges with three equivalent Dy(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-31°. The Nb(1)-O(2) bond length is 1.84 Å. The Nb(1)-O(3) bond length is 2.17 Å. There is one shorter (1.89 Å) and one longer (2.36 Å) Nb(1)-O(1) bond length. Both Nb(1)-O(4) bond lengths are 2.05 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Dy(1) and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a linear geometry to one Dy(1) and one Nb(1) atom. In the third O site, O(3) is bonded to three equivalent Dy(1) and one Nb(1) atom to form a mixture of corner and edge-sharing ODy3Nb tetrahedra. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Dy(1) and two equivalent Nb(1) atoms.