La3Sn4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Sn(1), two equivalent Sn(3), and four equivalent Sn(2) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to three equivalent Sn(3) and four equivalent Sn(2) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to four equivalent La(1) and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent La(2), four equivalent La(1), one Sn(3), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to three equivalent La(2), four equivalent La(1), and two equivalent Sn(2) atoms.
La3Sn4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Sn(1), two equivalent Sn(3), and four equivalent Sn(2) atoms. Both La(1)-Sn(1) bond lengths are 3.45 Å. Both La(1)-Sn(3) bond lengths are 3.41 Å. There are a spread of La(1)-Sn(2) bond distances ranging from 3.34-3.45 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to three equivalent Sn(3) and four equivalent Sn(2) atoms. There is one shorter (3.25 Å) and two longer (3.57 Å) La(2)-Sn(3) bond lengths. All La(2)-Sn(2) bond lengths are 3.34 Å. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to four equivalent La(1) and four equivalent Sn(2) atoms. All Sn(1)-Sn(2) bond lengths are 3.19 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent La(2), four equivalent La(1), one Sn(3), and two equivalent Sn(1) atoms. The Sn(2)-Sn(3) bond length is 2.94 Å. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to three equivalent La(2), four equivalent La(1), and two equivalent Sn(2) atoms.