U3Ta is beta-derived structured and crystallizes in the hexagonal P6_3/mmc space group. U(1) is bonded to eight equivalent U(1) and four equivalent Ta(1) atoms to form distorted UU8Ta4 cuboctahedra that share corners with four equivalent Ta(1)U12 cuboctahedra, corners with fourteen equivalent U(1)U8Ta4 cuboctahedra, edges with six equivalent Ta(1)U12 cuboctahedra, edges with twelve equivalent U(1)U8Ta4 cuboctahedra, faces with four equivalent Ta(1)U12 cuboctahedra, and faces with sixteen equivalent U(1)U8Ta4 cuboctahedra. Ta(1) is bonded to twelve equivalent U(1) atoms to form TaU12 cuboctahedra that share corners with six equivalent Ta(1)U12 cuboctahedra, corners with twelve equivalent U(1)U8Ta4 cuboctahedra, edges with eighteen equivalent U(1)U8Ta4 cuboctahedra, faces with eight equivalent Ta(1)U12 cuboctahedra, and faces with twelve equivalent U(1)U8Ta4 cuboctahedra.
U3Ta is beta-derived structured and crystallizes in the hexagonal P6_3/mmc space group. U(1) is bonded to eight equivalent U(1) and four equivalent Ta(1) atoms to form distorted UU8Ta4 cuboctahedra that share corners with four equivalent Ta(1)U12 cuboctahedra, corners with fourteen equivalent U(1)U8Ta4 cuboctahedra, edges with six equivalent Ta(1)U12 cuboctahedra, edges with twelve equivalent U(1)U8Ta4 cuboctahedra, faces with four equivalent Ta(1)U12 cuboctahedra, and faces with sixteen equivalent U(1)U8Ta4 cuboctahedra. There are a spread of U(1)-U(1) bond distances ranging from 2.78-3.29 Å. There are two shorter (2.98 Å) and two longer (3.17 Å) U(1)-Ta(1) bond lengths. Ta(1) is bonded to twelve equivalent U(1) atoms to form TaU12 cuboctahedra that share corners with six equivalent Ta(1)U12 cuboctahedra, corners with twelve equivalent U(1)U8Ta4 cuboctahedra, edges with eighteen equivalent U(1)U8Ta4 cuboctahedra, faces with eight equivalent Ta(1)U12 cuboctahedra, and faces with twelve equivalent U(1)U8Ta4 cuboctahedra.