Dy2Ge2O7 is Baddeleyite-derived structured and crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded to one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form distorted DyO7 pentagonal bipyramids that share corners with three equivalent Dy(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Dy(1)O7 pentagonal bipyramids,  an edgeedge with one Ge(1)O4 tetrahedra, and  an edgeedge with one Ge(2)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Dy(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(2)O4 tetrahedra, and edges with two equivalent Dy(1)O7 pentagonal bipyramids. In the second Ge site, Ge(2) is bonded to one O(2), one O(4), and two equivalent O(5) atoms to form GeO4 tetrahedra that share corners with four equivalent Dy(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and edges with two equivalent Dy(1)O7 pentagonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Dy(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Dy(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Dy(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Dy(1) and one Ge(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Dy(1) and one Ge(2) atom.
Dy2Ge2O7 is Baddeleyite-derived structured and crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded to one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form distorted DyO7 pentagonal bipyramids that share corners with three equivalent Dy(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Dy(1)O7 pentagonal bipyramids,  an edgeedge with one Ge(1)O4 tetrahedra, and  an edgeedge with one Ge(2)O4 tetrahedra. The Dy(1)-O(2) bond length is 2.46 Å. The Dy(1)-O(3) bond length is 2.39 Å. The Dy(1)-O(4) bond length is 2.30 Å. There is one shorter (2.28 Å) and one longer (2.49 Å) Dy(1)-O(1) bond length. There is one shorter (2.23 Å) and one longer (2.44 Å) Dy(1)-O(5) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with four equivalent Dy(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(2)O4 tetrahedra, and edges with two equivalent Dy(1)O7 pentagonal bipyramids. The Ge(1)-O(2) bond length is 1.86 Å. The Ge(1)-O(3) bond length is 1.76 Å. Both Ge(1)-O(1) bond lengths are 1.75 Å. In the second Ge site, Ge(2) is bonded to one O(2), one O(4), and two equivalent O(5) atoms to form GeO4 tetrahedra that share corners with four equivalent Dy(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and edges with two equivalent Dy(1)O7 pentagonal bipyramids. The Ge(2)-O(2) bond length is 1.83 Å. The Ge(2)-O(4) bond length is 1.74 Å. Both Ge(2)-O(5) bond lengths are 1.77 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Dy(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Dy(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Dy(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Dy(1) and one Ge(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Dy(1) and one Ge(2) atom.