Eu2Ni3Sb4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), four equivalent Sb(2), and five equivalent Sb(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(2) atoms. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(1) atoms. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 2-coordinate geometry to five equivalent Eu(1), two equivalent Ni(2), and one Sb(2) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ni(1), two equivalent Ni(3), and one Sb(1) atom.
Eu2Ni3Sb4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), four equivalent Sb(2), and five equivalent Sb(1) atoms. Both Eu(1)-Ni(1) bond lengths are 3.48 Å. Both Eu(1)-Ni(2) bond lengths are 3.38 Å. Both Eu(1)-Ni(3) bond lengths are 3.48 Å. All Eu(1)-Sb(2) bond lengths are 3.42 Å. There are four shorter (3.41 Å) and one longer (3.70 Å) Eu(1)-Sb(1) bond length. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(2) atoms. All Ni(1)-Sb(2) bond lengths are 2.50 Å. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(1) atoms. All Ni(2)-Sb(1) bond lengths are 2.45 Å. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Sb(2) atoms. All Ni(3)-Sb(2) bond lengths are 2.50 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 2-coordinate geometry to five equivalent Eu(1), two equivalent Ni(2), and one Sb(2) atom. The Sb(1)-Sb(2) bond length is 2.96 Å. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ni(1), two equivalent Ni(3), and one Sb(1) atom.