Ru4Al3B2 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a body-centered cubic geometry to two equivalent Al(1), four equivalent Al(3), and two equivalent B(1) atoms. In the second Ru site, Ru(2) is bonded in a 10-coordinate geometry to two equivalent Al(2), four equivalent Al(3), and four equivalent B(1) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a body-centered cubic geometry to eight equivalent Ru(1) atoms. In the second Al site, Al(2) is bonded to eight equivalent Ru(2) and four equivalent B(1) atoms to form distorted face-sharing AlB4Ru8 cuboctahedra. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to four equivalent Ru(1), four equivalent Ru(2), one Al(3), and two equivalent B(1) atoms. B(1) is bonded in a 9-coordinate geometry to two equivalent Ru(1), four equivalent Ru(2), one Al(2), and two equivalent Al(3) atoms.
Ru4Al3B2 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a body-centered cubic geometry to two equivalent Al(1), four equivalent Al(3), and two equivalent B(1) atoms. Both Ru(1)-Al(1) bond lengths are 2.57 Å. All Ru(1)-Al(3) bond lengths are 2.54 Å. Both Ru(1)-B(1) bond lengths are 2.14 Å. In the second Ru site, Ru(2) is bonded in a 10-coordinate geometry to two equivalent Al(2), four equivalent Al(3), and four equivalent B(1) atoms. Both Ru(2)-Al(2) bond lengths are 2.61 Å. All Ru(2)-Al(3) bond lengths are 2.86 Å. All Ru(2)-B(1) bond lengths are 2.27 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a body-centered cubic geometry to eight equivalent Ru(1) atoms. In the second Al site, Al(2) is bonded to eight equivalent Ru(2) and four equivalent B(1) atoms to form distorted face-sharing AlB4Ru8 cuboctahedra. All Al(2)-B(1) bond lengths are 2.33 Å. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to four equivalent Ru(1), four equivalent Ru(2), one Al(3), and two equivalent B(1) atoms. The Al(3)-Al(3) bond length is 2.61 Å. Both Al(3)-B(1) bond lengths are 2.62 Å. B(1) is bonded in a 9-coordinate geometry to two equivalent Ru(1), four equivalent Ru(2), one Al(2), and two equivalent Al(3) atoms.