CePtAl3 crystallizes in the tetragonal I-4m2 space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Al(2), and eight equivalent Al(1) atoms. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Ce(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted water-like geometry to four equivalent Ce(1), two equivalent Pt(1), one Al(1), and two equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Ce(1), four equivalent Pt(1), and four equivalent Al(1) atoms to form a mixture of distorted face and corner-sharing AlCe4Al4Pt4 cuboctahedra.
CePtAl3 crystallizes in the tetragonal I-4m2 space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Al(2), and eight equivalent Al(1) atoms. All Ce(1)-Pt(1) bond lengths are 3.47 Å. All Ce(1)-Al(2) bond lengths are 3.47 Å. All Ce(1)-Al(1) bond lengths are 3.20 Å. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Ce(1), four equivalent Al(1), and four equivalent Al(2) atoms. All Pt(1)-Al(1) bond lengths are 2.56 Å. All Pt(1)-Al(2) bond lengths are 2.93 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted water-like geometry to four equivalent Ce(1), two equivalent Pt(1), one Al(1), and two equivalent Al(2) atoms. The Al(1)-Al(1) bond length is 2.54 Å. Both Al(1)-Al(2) bond lengths are 2.56 Å. In the second Al site, Al(2) is bonded to four equivalent Ce(1), four equivalent Pt(1), and four equivalent Al(1) atoms to form a mixture of distorted face and corner-sharing AlCe4Al4Pt4 cuboctahedra.