Lu5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. In the second Lu site, Lu(2) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Lu(1) and five equivalent Lu(2) atoms.
Lu5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. All Lu(1)-Si(1) bond lengths are 2.95 Å. In the second Lu site, Lu(2) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. There are a spread of Lu(2)-Si(1) bond distances ranging from 2.82-3.32 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Lu(1) and five equivalent Lu(2) atoms.