Y4GeO10 is Baddeleyite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(9) atom. In the second Y site, Y(2) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(4)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Y(4)O7 pentagonal bipyramid, and edges with three equivalent Y(3)O7 pentagonal bipyramids. In the third Y site, Y(3) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share  a cornercorner with one Ge(1)O4 tetrahedra, edges with two equivalent Y(4)O7 pentagonal bipyramids, and edges with three equivalent Y(2)O7 pentagonal bipyramids. In the fourth Y site, Y(4) is bonded to one O(10), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(2)O7 pentagonal bipyramids, corners with three equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Y(2)O7 pentagonal bipyramid, and edges with two equivalent Y(3)O7 pentagonal bipyramids. Ge(1) is bonded to one O(1), one O(10), one O(2), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Y(3)O7 pentagonal bipyramid, corners with two equivalent Y(2)O7 pentagonal bipyramids, and corners with three equivalent Y(4)O7 pentagonal bipyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Y(2), one Y(3), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Y(4), and one Ge(1) atom. In the third O site, O(3) is bonded to one Y(1), one Y(2), one Y(3), and one Y(4) atom to form OY4 tetrahedra that share  a cornercorner with one O(10)Y3Ge tetrahedra,  an edgeedge with one O(10)Y3Ge tetrahedra, and edges with two equivalent O(4)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(2), one Y(3), and one Y(4) atom to form OY4 tetrahedra that share corners with three equivalent O(10)Y3Ge tetrahedra and edges with two equivalent O(3)Y4 tetrahedra. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Y(2) and one Y(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(4), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Y(1), one Y(3), and one Y(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Y(2), one Y(3), and one Y(4) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Y(1), one Y(2), and one Y(3) atom. In the tenth O site, O(10) is bonded to one Y(1), one Y(2), one Y(4), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OY3Ge tetrahedra.
Y4GeO10 is Baddeleyite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(9) atom. The Y(1)-O(10) bond length is 2.53 Å. The Y(1)-O(2) bond length is 2.36 Å. The Y(1)-O(3) bond length is 2.31 Å. The Y(1)-O(4) bond length is 2.35 Å. The Y(1)-O(6) bond length is 2.38 Å. The Y(1)-O(7) bond length is 2.26 Å. The Y(1)-O(9) bond length is 2.42 Å. In the second Y site, Y(2) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(4)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Y(4)O7 pentagonal bipyramid, and edges with three equivalent Y(3)O7 pentagonal bipyramids. The Y(2)-O(1) bond length is 2.34 Å. The Y(2)-O(10) bond length is 2.44 Å. The Y(2)-O(3) bond length is 2.29 Å. The Y(2)-O(4) bond length is 2.28 Å. The Y(2)-O(5) bond length is 2.31 Å. The Y(2)-O(8) bond length is 2.25 Å. The Y(2)-O(9) bond length is 2.32 Å. In the third Y site, Y(3) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share  a cornercorner with one Ge(1)O4 tetrahedra, edges with two equivalent Y(4)O7 pentagonal bipyramids, and edges with three equivalent Y(2)O7 pentagonal bipyramids. The Y(3)-O(1) bond length is 2.30 Å. The Y(3)-O(3) bond length is 2.26 Å. The Y(3)-O(4) bond length is 2.35 Å. The Y(3)-O(5) bond length is 2.30 Å. The Y(3)-O(7) bond length is 2.30 Å. The Y(3)-O(8) bond length is 2.28 Å. The Y(3)-O(9) bond length is 2.33 Å. In the fourth Y site, Y(4) is bonded to one O(10), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(2)O7 pentagonal bipyramids, corners with three equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Y(2)O7 pentagonal bipyramid, and edges with two equivalent Y(3)O7 pentagonal bipyramids. The Y(4)-O(10) bond length is 2.43 Å. The Y(4)-O(2) bond length is 2.29 Å. The Y(4)-O(3) bond length is 2.33 Å. The Y(4)-O(4) bond length is 2.31 Å. The Y(4)-O(6) bond length is 2.42 Å. The Y(4)-O(7) bond length is 2.36 Å. The Y(4)-O(8) bond length is 2.27 Å. Ge(1) is bonded to one O(1), one O(10), one O(2), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Y(3)O7 pentagonal bipyramid, corners with two equivalent Y(2)O7 pentagonal bipyramids, and corners with three equivalent Y(4)O7 pentagonal bipyramids. The Ge(1)-O(1) bond length is 1.77 Å. The Ge(1)-O(10) bond length is 1.82 Å. The Ge(1)-O(2) bond length is 1.76 Å. The Ge(1)-O(6) bond length is 1.79 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Y(2), one Y(3), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Y(4), and one Ge(1) atom. In the third O site, O(3) is bonded to one Y(1), one Y(2), one Y(3), and one Y(4) atom to form OY4 tetrahedra that share  a cornercorner with one O(10)Y3Ge tetrahedra,  an edgeedge with one O(10)Y3Ge tetrahedra, and edges with two equivalent O(4)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(2), one Y(3), and one Y(4) atom to form OY4 tetrahedra that share corners with three equivalent O(10)Y3Ge tetrahedra and edges with two equivalent O(3)Y4 tetrahedra. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Y(2) and one Y(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(4), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Y(1), one Y(3), and one Y(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Y(2), one Y(3), and one Y(4) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Y(1), one Y(2), and one Y(3) atom. In the tenth O site, O(10) is bonded to one Y(1), one Y(2), one Y(4), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OY3Ge tetrahedra.