LiDy2Nb2O8 crystallizes in the monoclinic C2 space group. Li(1) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form LiO4 tetrahedra that share corners with two equivalent Nb(1)O4 tetrahedra and  an edgeedge with one Nb(2)O4 trigonal pyramid. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NbO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra. In the second Nb site, Nb(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form distorted NbO4 trigonal pyramids that share  an edgeedge with one Li(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(2), and one Nb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(1), one Dy(1), one Dy(2), and one Nb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(2), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), one Dy(1), one Dy(2), and one Nb(2) atom.
LiDy2Nb2O8 crystallizes in the monoclinic C2 space group. Li(1) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form LiO4 tetrahedra that share corners with two equivalent Nb(1)O4 tetrahedra and  an edgeedge with one Nb(2)O4 trigonal pyramid. Both Li(1)-O(2) bond lengths are 1.94 Å. Both Li(1)-O(4) bond lengths are 1.98 Å. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Dy(1)-O(1) bond lengths are 2.28 Å. Both Dy(1)-O(2) bond lengths are 2.39 Å. Both Dy(1)-O(3) bond lengths are 2.61 Å. Both Dy(1)-O(4) bond lengths are 2.46 Å. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Dy(2)-O(1) bond lengths are 2.43 Å. Both Dy(2)-O(2) bond lengths are 2.66 Å. Both Dy(2)-O(3) bond lengths are 2.28 Å. Both Dy(2)-O(4) bond lengths are 2.37 Å. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NbO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra. Both Nb(1)-O(1) bond lengths are 1.88 Å. Both Nb(1)-O(2) bond lengths are 1.89 Å. In the second Nb site, Nb(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form distorted NbO4 trigonal pyramids that share  an edgeedge with one Li(1)O4 tetrahedra. Both Nb(2)-O(3) bond lengths are 1.90 Å. Both Nb(2)-O(4) bond lengths are 1.97 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), one Dy(2), and one Nb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(1), one Dy(1), one Dy(2), and one Nb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(2), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), one Dy(1), one Dy(2), and one Nb(2) atom.