NdCeSi2 crystallizes in the orthorhombic Pmc2_1 space group. Nd(1) is bonded in a 7-coordinate geometry to three equivalent Si(2) and four equivalent Si(1) atoms. Ce(1) is bonded in a 7-coordinate geometry to three equivalent Si(1) and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), three equivalent Ce(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Nd(1), four equivalent Ce(1), and two equivalent Si(1) atoms.
NdCeSi2 crystallizes in the orthorhombic Pmc2_1 space group. Nd(1) is bonded in a 7-coordinate geometry to three equivalent Si(2) and four equivalent Si(1) atoms. There is one shorter (3.18 Å) and two longer (3.23 Å) Nd(1)-Si(2) bond lengths. All Nd(1)-Si(1) bond lengths are 3.09 Å. Ce(1) is bonded in a 7-coordinate geometry to three equivalent Si(1) and four equivalent Si(2) atoms. There is one shorter (3.19 Å) and two longer (3.23 Å) Ce(1)-Si(1) bond lengths. There are two shorter (3.08 Å) and two longer (3.09 Å) Ce(1)-Si(2) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), three equivalent Ce(1), and two equivalent Si(2) atoms. Both Si(1)-Si(2) bond lengths are 2.49 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Nd(1), four equivalent Ce(1), and two equivalent Si(1) atoms.