Materials Data on U2Al3Ga by Materials Project
U2GaAl3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. U is bonded in a 12-coordinate geometry to four equivalent U, three equivalent Ga, and nine equivalent Al atoms. There are one shorter (3.32 Å) and three longer (3.35 Å) U–U bond lengths. All U–Ga bond lengths are 3.20 Å. There are six shorter (3.19 Å) and three longer (3.21 Å) U–Al bond lengths. Ga is bonded to six equivalent U and six equivalent Al atoms to form GaU6Al6 cuboctahedra that share corners with six equivalent GaU6Al6 cuboctahedra, corners with twelve equivalent AlU6Al4Ga2 cuboctahedra, edges with six equivalent GaU6Al6 cuboctahedra, and faces with eighteen equivalent AlU6Al4Ga2 cuboctahedra. All Ga–Al bond lengths are 2.73 Å. Al is bonded to six equivalent U, two equivalent Ga, and four equivalent Al atoms to form AlU6Al4Ga2 cuboctahedra that share corners with four equivalent GaU6Al6 cuboctahedra, corners with fourteen equivalent AlU6Al4Ga2 cuboctahedra, edges with six equivalent AlU6Al4Ga2 cuboctahedra, faces with six equivalent GaU6Al6 cuboctahedra, and faces with twelve equivalent AlU6Al4Ga2 cuboctahedra. All Al–Al bond lengths are 2.73 Å.