U3Se5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 10-coordinate geometry to two equivalent Se(2) and eight equivalent Se(1) atoms. In the second U site, U(2) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent U(1) atoms to form distorted edge-sharing SeU4 tetrahedra. In the second Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent U(2) and four equivalent U(1) atoms.
U3Se5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 10-coordinate geometry to two equivalent Se(2) and eight equivalent Se(1) atoms. Both U(1)-Se(2) bond lengths are 2.91 Å. There are a spread of U(1)-Se(1) bond distances ranging from 2.93-3.30 Å. In the second U site, U(2) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. All U(2)-Se(1) bond lengths are 2.98 Å. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent U(1) atoms to form distorted edge-sharing SeU4 tetrahedra. In the second Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent U(2) and four equivalent U(1) atoms.