La3Pd5Si crystallizes in the orthorhombic Imma space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 11-coordinate geometry to two equivalent Pd(2), eight equivalent Pd(1), and one Si(1) atom. In the second La site, La(2) is bonded in a 11-coordinate geometry to two equivalent Pd(2), eight equivalent Pd(1), and one Si(1) atom. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 11-coordinate geometry to two equivalent La(2), four equivalent La(1), one Pd(2), three equivalent Pd(1), and one Si(1) atom. In the second Pd site, Pd(2) is bonded in a 2-coordinate geometry to two equivalent La(2), four equivalent La(1), four equivalent Pd(1), and two equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to one La(2), two equivalent La(1), two equivalent Pd(2), and four equivalent Pd(1) atoms.
La3Pd5Si crystallizes in the orthorhombic Imma space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 11-coordinate geometry to two equivalent Pd(2), eight equivalent Pd(1), and one Si(1) atom. Both La(1)-Pd(2) bond lengths are 3.25 Å. There are a spread of La(1)-Pd(1) bond distances ranging from 3.00-3.33 Å. The La(1)-Si(1) bond length is 3.20 Å. In the second La site, La(2) is bonded in a 11-coordinate geometry to two equivalent Pd(2), eight equivalent Pd(1), and one Si(1) atom. Both La(2)-Pd(2) bond lengths are 3.49 Å. There are four shorter (2.99 Å) and four longer (3.34 Å) La(2)-Pd(1) bond lengths. The La(2)-Si(1) bond length is 3.11 Å. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 11-coordinate geometry to two equivalent La(2), four equivalent La(1), one Pd(2), three equivalent Pd(1), and one Si(1) atom. The Pd(1)-Pd(2) bond length is 3.07 Å. There are a spread of Pd(1)-Pd(1) bond distances ranging from 2.95-3.02 Å. The Pd(1)-Si(1) bond length is 2.51 Å. In the second Pd site, Pd(2) is bonded in a 2-coordinate geometry to two equivalent La(2), four equivalent La(1), four equivalent Pd(1), and two equivalent Si(1) atoms. Both Pd(2)-Si(1) bond lengths are 2.48 Å. Si(1) is bonded in a 9-coordinate geometry to one La(2), two equivalent La(1), two equivalent Pd(2), and four equivalent Pd(1) atoms.