UNiAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to one Ni(1) and four equivalent Ni(2) atoms. In the second U site, U(2) is bonded in a 5-coordinate geometry to one Ni(1) and four equivalent Ni(2) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one U(1), two equivalent U(2), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent U(1), four equivalent U(2), one Al(1), and two equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to two equivalent Ni(1) and two equivalent Ni(2) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to two equivalent Ni(1) and two equivalent Ni(2) atoms.
UNiAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to one Ni(1) and four equivalent Ni(2) atoms. The U(1)-Ni(1) bond length is 2.78 Å. All U(1)-Ni(2) bond lengths are 2.85 Å. In the second U site, U(2) is bonded in a 5-coordinate geometry to one Ni(1) and four equivalent Ni(2) atoms. The U(2)-Ni(1) bond length is 2.87 Å. There are two shorter (2.83 Å) and two longer (2.86 Å) U(2)-Ni(2) bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one U(1), two equivalent U(2), two equivalent Al(1), and four equivalent Al(2) atoms. Both Ni(1)-Al(1) bond lengths are 2.58 Å. All Ni(1)-Al(2) bond lengths are 2.58 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent U(1), four equivalent U(2), one Al(1), and two equivalent Al(2) atoms. The Ni(2)-Al(1) bond length is 2.59 Å. There is one shorter (2.57 Å) and one longer (2.64 Å) Ni(2)-Al(2) bond length. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to two equivalent Ni(1) and two equivalent Ni(2) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to two equivalent Ni(1) and two equivalent Ni(2) atoms.