U(Ga) crystallizes in the orthorhombic Cmmm space group. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(2), two equivalent U(3), and four equivalent Ga(1) atoms to form a mixture of edge and corner-sharing UU4Ga4 hexagonal bipyramids. In the second U site, U(2) is bonded in a distorted q6 geometry to two equivalent U(1), four equivalent Ga(1), and four equivalent Ga(2) atoms. In the third U site, U(3) is bonded in a 9-coordinate geometry to one U(1), two equivalent U(3), two equivalent Ga(1), and four equivalent Ga(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent U(3), and two equivalent Ga(1) atoms. In the second Ga site, Ga(2) is bonded in a 8-coordinate geometry to two equivalent U(2), four equivalent U(3), and two equivalent Ga(2) atoms.
U(Ga) crystallizes in the orthorhombic Cmmm space group. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(2), two equivalent U(3), and four equivalent Ga(1) atoms to form a mixture of edge and corner-sharing UU4Ga4 hexagonal bipyramids. Both U(1)-U(2) bond lengths are 2.72 Å. Both U(1)-U(3) bond lengths are 2.54 Å. All U(1)-Ga(1) bond lengths are 3.04 Å. In the second U site, U(2) is bonded in a distorted q6 geometry to two equivalent U(1), four equivalent Ga(1), and four equivalent Ga(2) atoms. All U(2)-Ga(1) bond lengths are 3.03 Å. All U(2)-Ga(2) bond lengths are 3.02 Å. In the third U site, U(3) is bonded in a 9-coordinate geometry to one U(1), two equivalent U(3), two equivalent Ga(1), and four equivalent Ga(2) atoms. Both U(3)-U(3) bond lengths are 2.73 Å. Both U(3)-Ga(1) bond lengths are 3.18 Å. All U(3)-Ga(2) bond lengths are 3.05 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent U(3), and two equivalent Ga(1) atoms. There is one shorter (2.69 Å) and one longer (2.76 Å) Ga(1)-Ga(1) bond length. In the second Ga site, Ga(2) is bonded in a 8-coordinate geometry to two equivalent U(2), four equivalent U(3), and two equivalent Ga(2) atoms. Both Ga(2)-Ga(2) bond lengths are 2.71 Å.