Materials Data on GdU3 by Materials Project
U3Gd is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded to eight U and four equivalent Gd atoms to form UGd4U8 cuboctahedra that share corners with twelve equivalent UGd4U8 cuboctahedra, edges with eight equivalent GdU12 cuboctahedra, edges with sixteen UGd4U8 cuboctahedra, faces with four equivalent GdU12 cuboctahedra, and faces with fourteen UGd4U8 cuboctahedra. There are four shorter (3.09 Å) and four longer (3.25 Å) U–U bond lengths. All U–Gd bond lengths are 3.25 Å. In the second U site, U is bonded to eight equivalent U and four equivalent Gd atoms to form distorted UGd4U8 cuboctahedra that share corners with four equivalent UGd4U8 cuboctahedra, corners with eight equivalent GdU12 cuboctahedra, edges with twenty-four UGd4U8 cuboctahedra, faces with six equivalent GdU12 cuboctahedra, and faces with twelve UGd4U8 cuboctahedra. All U–Gd bond lengths are 3.09 Å. Gd is bonded to twelve U atoms to form GdU12 cuboctahedra that share corners with four equivalent GdU12 cuboctahedra, corners with eight equivalent UGd4U8 cuboctahedra, edges with eight equivalent GdU12 cuboctahedra, edges with sixteen equivalent UGd4U8 cuboctahedra, faces with four equivalent GdU12 cuboctahedra, and faces with fourteen UGd4U8 cuboctahedra.