CeSi5 crystallizes in the orthorhombic Immm space group. Ce(1) is bonded in a 14-coordinate geometry to two equivalent Si(2) and twelve equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to three equivalent Ce(1), two equivalent Si(2), and three equivalent Si(1) atoms. In the second Si site, Si(2) is bonded in a distorted q6 geometry to two equivalent Ce(1) and eight equivalent Si(1) atoms.
CeSi5 crystallizes in the orthorhombic Immm space group. Ce(1) is bonded in a 14-coordinate geometry to two equivalent Si(2) and twelve equivalent Si(1) atoms. Both Ce(1)-Si(2) bond lengths are 3.02 Å. There are eight shorter (3.07 Å) and four longer (3.28 Å) Ce(1)-Si(1) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to three equivalent Ce(1), two equivalent Si(2), and three equivalent Si(1) atoms. Both Si(1)-Si(2) bond lengths are 2.74 Å. There is one shorter (2.39 Å) and two longer (2.47 Å) Si(1)-Si(1) bond lengths. In the second Si site, Si(2) is bonded in a distorted q6 geometry to two equivalent Ce(1) and eight equivalent Si(1) atoms.