UNiGa crystallizes in the hexagonal P-62m space group. U(1) is bonded in a 11-coordinate geometry to one Ni(2), four equivalent Ni(1), and six equivalent Ga(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent U(1) and six equivalent Ga(1) atoms. In the second Ni site, Ni(1) is bonded in a 9-coordinate geometry to six equivalent U(1) and three equivalent Ga(1) atoms. Ga(1) is bonded to six equivalent U(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ga(1) atoms to form a mixture of distorted face, corner, and edge-sharing GaU6Ga2Ni4 cuboctahedra.
UNiGa crystallizes in the hexagonal P-62m space group. U(1) is bonded in a 11-coordinate geometry to one Ni(2), four equivalent Ni(1), and six equivalent Ga(1) atoms. The U(1)-Ni(2) bond length is 2.83 Å. All U(1)-Ni(1) bond lengths are 2.83 Å. There are two shorter (3.01 Å) and four longer (3.19 Å) U(1)-Ga(1) bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent U(1) and six equivalent Ga(1) atoms. All Ni(2)-Ga(1) bond lengths are 2.57 Å. In the second Ni site, Ni(1) is bonded in a 9-coordinate geometry to six equivalent U(1) and three equivalent Ga(1) atoms. All Ni(1)-Ga(1) bond lengths are 2.58 Å. Ga(1) is bonded to six equivalent U(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ga(1) atoms to form a mixture of distorted face, corner, and edge-sharing GaU6Ga2Ni4 cuboctahedra. Both Ga(1)-Ga(1) bond lengths are 2.71 Å.