UF3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. U(1) is bonded in a distorted body-centered cubic geometry to six equivalent F(2) and eight equivalent F(1) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded to four equivalent U(1) atoms to form FU4 tetrahedra that share corners with twelve equivalent F(2)U6 octahedra, corners with sixteen equivalent F(1)U4 tetrahedra, edges with six equivalent F(1)U4 tetrahedra, and faces with four equivalent F(2)U6 octahedra. The corner-sharing octahedral tilt angles are 55°. In the second F site, F(2) is bonded to six equivalent U(1) atoms to form FU6 octahedra that share corners with six equivalent F(2)U6 octahedra, corners with twenty-four equivalent F(1)U4 tetrahedra, edges with twelve equivalent F(2)U6 octahedra, and faces with eight equivalent F(1)U4 tetrahedra. The corner-sharing octahedra are not tilted.
UF3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. U(1) is bonded in a distorted body-centered cubic geometry to six equivalent F(2) and eight equivalent F(1) atoms. All U(1)-F(2) bond lengths are 2.91 Å. All U(1)-F(1) bond lengths are 2.52 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded to four equivalent U(1) atoms to form FU4 tetrahedra that share corners with twelve equivalent F(2)U6 octahedra, corners with sixteen equivalent F(1)U4 tetrahedra, edges with six equivalent F(1)U4 tetrahedra, and faces with four equivalent F(2)U6 octahedra. The corner-sharing octahedral tilt angles are 55°. In the second F site, F(2) is bonded to six equivalent U(1) atoms to form FU6 octahedra that share corners with six equivalent F(2)U6 octahedra, corners with twenty-four equivalent F(1)U4 tetrahedra, edges with twelve equivalent F(2)U6 octahedra, and faces with eight equivalent F(1)U4 tetrahedra. The corner-sharing octahedra are not tilted.