Ho3(RuAl3)4 crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded in a 15-coordinate geometry to four equivalent Ru(1), one Al(4), two equivalent Al(1), two equivalent Al(3), and six equivalent Al(2) atoms. There are two inequivalent Ru sites. In the first Ru site, Ru(2) is bonded in a body-centered cubic geometry to two equivalent Al(4) and six equivalent Al(2) atoms. In the second Ru site, Ru(1) is bonded in a 8-coordinate geometry to four equivalent Ho(1), two equivalent Al(1), two equivalent Al(3), and four equivalent Al(2) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal planar geometry to three equivalent Ho(1) and three equivalent Ru(1) atoms. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to three equivalent Ho(1), one Ru(2), and two equivalent Ru(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Ho(1) and two equivalent Ru(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted linear geometry to three equivalent Ho(1) and two equivalent Ru(2) atoms.
Ho3(RuAl3)4 crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded in a 15-coordinate geometry to four equivalent Ru(1), one Al(4), two equivalent Al(1), two equivalent Al(3), and six equivalent Al(2) atoms. All Ho(1)-Ru(1) bond lengths are 3.34 Å. The Ho(1)-Al(4) bond length is 2.92 Å. Both Ho(1)-Al(1) bond lengths are 3.11 Å. Both Ho(1)-Al(3) bond lengths are 3.02 Å. There are two shorter (3.14 Å) and four longer (3.18 Å) Ho(1)-Al(2) bond lengths. There are two inequivalent Ru sites. In the first Ru site, Ru(2) is bonded in a body-centered cubic geometry to two equivalent Al(4) and six equivalent Al(2) atoms. Both Ru(2)-Al(4) bond lengths are 2.37 Å. All Ru(2)-Al(2) bond lengths are 2.57 Å. In the second Ru site, Ru(1) is bonded in a 8-coordinate geometry to four equivalent Ho(1), two equivalent Al(1), two equivalent Al(3), and four equivalent Al(2) atoms. Both Ru(1)-Al(1) bond lengths are 2.53 Å. Both Ru(1)-Al(3) bond lengths are 2.55 Å. All Ru(1)-Al(2) bond lengths are 2.66 Å. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal planar geometry to three equivalent Ho(1) and three equivalent Ru(1) atoms. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to three equivalent Ho(1), one Ru(2), and two equivalent Ru(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Ho(1) and two equivalent Ru(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted linear geometry to three equivalent Ho(1) and two equivalent Ru(2) atoms.