Sc5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sc(2) and five equivalent Sc(1) atoms.
Sc5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. There are a spread of Sc(1)-Si(1) bond distances ranging from 2.72-3.16 Å. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. All Sc(2)-Si(1) bond lengths are 2.83 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sc(2) and five equivalent Sc(1) atoms.