KSi crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to three equivalent K(2), four equivalent K(1), and three equivalent Si(1) atoms.
KSi crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. There are a spread of K(1)-Si(1) bond distances ranging from 3.49-3.64 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are a spread of K(2)-Si(1) bond distances ranging from 3.48-3.65 Å. Si(1) is bonded in a 10-coordinate geometry to three equivalent K(2), four equivalent K(1), and three equivalent Si(1) atoms. There are two shorter (2.41 Å) and one longer (2.43 Å) Si(1)-Si(1) bond length.