Sr2UO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one U(1)O6 octahedra,  a cornercorner with one U(2)O6 octahedra,  an edgeedge with one U(2)O6 octahedra, edges with two equivalent U(1)O6 octahedra, and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 24-38°. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form UO6 octahedra that share corners with two equivalent U(2)O6 octahedra, corners with two equivalent Sr(1)O7 pentagonal bipyramids, and edges with four equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. In the second U site, U(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form UO6 octahedra that share corners with two equivalent U(1)O6 octahedra, corners with two equivalent Sr(1)O7 pentagonal bipyramids, and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(2), one U(1), and one U(2) atom to form distorted OSr2U2 trigonal pyramids that share corners with three equivalent O(5)Sr3U tetrahedra, corners with two equivalent O(1)Sr2U2 trigonal pyramids, corners with three equivalent O(4)Sr3U trigonal pyramids,  an edgeedge with one O(5)Sr3U tetrahedra, and  an edgeedge with one O(4)Sr3U trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one U(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one U(2) atom. In the fourth O site, O(4) is bonded to one Sr(1), two equivalent Sr(2), and one U(2) atom to form distorted OSr3U trigonal pyramids that share corners with four equivalent O(5)Sr3U tetrahedra, corners with three equivalent O(1)Sr2U2 trigonal pyramids, corners with three equivalent O(4)Sr3U trigonal pyramids, and  an edgeedge with one O(1)Sr2U2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), and one U(1) atom to form distorted OSr3U tetrahedra that share corners with three equivalent O(5)Sr3U tetrahedra, corners with three equivalent O(1)Sr2U2 trigonal pyramids, corners with four equivalent O(4)Sr3U trigonal pyramids, and  an edgeedge with one O(1)Sr2U2 trigonal pyramid.
Sr2UO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one U(1)O6 octahedra,  a cornercorner with one U(2)O6 octahedra,  an edgeedge with one U(2)O6 octahedra, edges with two equivalent U(1)O6 octahedra, and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 24-38°. The Sr(1)-O(1) bond length is 2.58 Å. The Sr(1)-O(3) bond length is 2.48 Å. The Sr(1)-O(4) bond length is 2.73 Å. There is one shorter (2.50 Å) and one longer (2.52 Å) Sr(1)-O(2) bond length. There is one shorter (2.57 Å) and one longer (2.66 Å) Sr(1)-O(5) bond length. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms. The Sr(2)-O(1) bond length is 2.54 Å. The Sr(2)-O(2) bond length is 2.87 Å. The Sr(2)-O(5) bond length is 2.51 Å. There is one shorter (2.75 Å) and one longer (2.94 Å) Sr(2)-O(3) bond length. There is one shorter (2.44 Å) and one longer (2.51 Å) Sr(2)-O(4) bond length. There are two inequivalent U sites. In the first U site, U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form UO6 octahedra that share corners with two equivalent U(2)O6 octahedra, corners with two equivalent Sr(1)O7 pentagonal bipyramids, and edges with four equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. Both U(1)-O(1) bond lengths are 2.21 Å. Both U(1)-O(2) bond lengths are 2.04 Å. Both U(1)-O(5) bond lengths are 2.02 Å. In the second U site, U(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form UO6 octahedra that share corners with two equivalent U(1)O6 octahedra, corners with two equivalent Sr(1)O7 pentagonal bipyramids, and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. Both U(2)-O(1) bond lengths are 2.19 Å. Both U(2)-O(3) bond lengths are 1.98 Å. Both U(2)-O(4) bond lengths are 2.10 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(2), one U(1), and one U(2) atom to form distorted OSr2U2 trigonal pyramids that share corners with three equivalent O(5)Sr3U tetrahedra, corners with two equivalent O(1)Sr2U2 trigonal pyramids, corners with three equivalent O(4)Sr3U trigonal pyramids,  an edgeedge with one O(5)Sr3U tetrahedra, and  an edgeedge with one O(4)Sr3U trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one U(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one U(2) atom. In the fourth O site, O(4) is bonded to one Sr(1), two equivalent Sr(2), and one U(2) atom to form distorted OSr3U trigonal pyramids that share corners with four equivalent O(5)Sr3U tetrahedra, corners with three equivalent O(1)Sr2U2 trigonal pyramids, corners with three equivalent O(4)Sr3U trigonal pyramids, and  an edgeedge with one O(1)Sr2U2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), and one U(1) atom to form distorted OSr3U tetrahedra that share corners with three equivalent O(5)Sr3U tetrahedra, corners with three equivalent O(1)Sr2U2 trigonal pyramids, corners with four equivalent O(4)Sr3U trigonal pyramids, and  an edgeedge with one O(1)Sr2U2 trigonal pyramid.