Pt12Si5 crystallizes in the tetragonal I4/m space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 4-coordinate geometry to one Si(2) and three equivalent Si(1) atoms. In the second Pt site, Pt(2) is bonded in a 2-coordinate geometry to four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to four equivalent Pt(2) and six equivalent Pt(1) atoms. In the second Si site, Si(2) is bonded in a body-centered cubic geometry to eight equivalent Pt(1) atoms.
Pt12Si5 crystallizes in the tetragonal I4/m space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 4-coordinate geometry to one Si(2) and three equivalent Si(1) atoms. The Pt(1)-Si(2) bond length is 2.47 Å. There are a spread of Pt(1)-Si(1) bond distances ranging from 2.42-2.85 Å. In the second Pt site, Pt(2) is bonded in a 2-coordinate geometry to four equivalent Si(1) atoms. There are a spread of Pt(2)-Si(1) bond distances ranging from 2.43-2.86 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to four equivalent Pt(2) and six equivalent Pt(1) atoms. In the second Si site, Si(2) is bonded in a body-centered cubic geometry to eight equivalent Pt(1) atoms.