CeRuAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 3-coordinate geometry to three equivalent Ce(2), one Ru(3), two equivalent Ru(1), two equivalent Ru(2), and four equivalent Al(2) atoms. In the second Ce site, Ce(2) is bonded in a 16-coordinate geometry to one Ce(2), three equivalent Ce(1), one Ru(1), two equivalent Ru(3), four equivalent Ru(2), two equivalent Al(2), and three equivalent Al(1) atoms. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to two equivalent Ce(2), four equivalent Ce(1), two equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing RuCe6Al6 cuboctahedra. In the second Ru site, Ru(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), two equivalent Ru(2), two equivalent Ru(3), and two equivalent Al(1) atoms. In the third Ru site, Ru(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), four equivalent Ru(2), and two equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to three equivalent Ce(2), one Ru(1), one Ru(3), two equivalent Ru(2), and two equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ce(2), four equivalent Ce(1), two equivalent Ru(1), two equivalent Al(1), and two equivalent Al(2) atoms.
CeRuAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 3-coordinate geometry to three equivalent Ce(2), one Ru(3), two equivalent Ru(1), two equivalent Ru(2), and four equivalent Al(2) atoms. There are two shorter (3.39 Å) and one longer (3.40 Å) Ce(1)-Ce(2) bond length. The Ce(1)-Ru(3) bond length is 2.91 Å. Both Ce(1)-Ru(1) bond lengths are 3.33 Å. Both Ce(1)-Ru(2) bond lengths are 2.89 Å. All Ce(1)-Al(2) bond lengths are 3.30 Å. In the second Ce site, Ce(2) is bonded in a 16-coordinate geometry to one Ce(2), three equivalent Ce(1), one Ru(1), two equivalent Ru(3), four equivalent Ru(2), two equivalent Al(2), and three equivalent Al(1) atoms. The Ce(2)-Ce(2) bond length is 2.81 Å. The Ce(2)-Ru(1) bond length is 3.13 Å. Both Ce(2)-Ru(3) bond lengths are 3.16 Å. There are two shorter (3.08 Å) and two longer (3.18 Å) Ce(2)-Ru(2) bond lengths. Both Ce(2)-Al(2) bond lengths are 3.19 Å. There is one shorter (3.18 Å) and two longer (3.36 Å) Ce(2)-Al(1) bond lengths. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to two equivalent Ce(2), four equivalent Ce(1), two equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing RuCe6Al6 cuboctahedra. Both Ru(1)-Al(1) bond lengths are 2.68 Å. There are two shorter (2.73 Å) and two longer (2.87 Å) Ru(1)-Al(2) bond lengths. In the second Ru site, Ru(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), two equivalent Ru(2), two equivalent Ru(3), and two equivalent Al(1) atoms. There is one shorter (2.83 Å) and one longer (2.84 Å) Ru(2)-Ru(2) bond length. There is one shorter (2.79 Å) and one longer (2.80 Å) Ru(2)-Ru(3) bond length. Both Ru(2)-Al(1) bond lengths are 2.58 Å. In the third Ru site, Ru(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), four equivalent Ru(2), and two equivalent Al(1) atoms. Both Ru(3)-Al(1) bond lengths are 2.58 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to three equivalent Ce(2), one Ru(1), one Ru(3), two equivalent Ru(2), and two equivalent Al(2) atoms. Both Al(1)-Al(2) bond lengths are 2.72 Å. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ce(2), four equivalent Ce(1), two equivalent Ru(1), two equivalent Al(1), and two equivalent Al(2) atoms. There is one shorter (2.80 Å) and one longer (2.87 Å) Al(2)-Al(2) bond length.