Eu7Au3 crystallizes in the hexagonal P6_3mc space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) atoms. In the second Eu site, Eu(3) is bonded in a distorted water-like geometry to two equivalent Au(1) atoms. In the third Eu site, Eu(2) is bonded in a distorted T-shaped geometry to three equivalent Au(1) atoms. Au(1) is bonded in a 6-coordinate geometry to one Eu(1), two equivalent Eu(3), and three equivalent Eu(2) atoms.
Eu7Au3 crystallizes in the hexagonal P6_3mc space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) atoms. All Eu(1)-Au(1) bond lengths are 3.13 Å. In the second Eu site, Eu(3) is bonded in a distorted water-like geometry to two equivalent Au(1) atoms. Both Eu(3)-Au(1) bond lengths are 3.13 Å. In the third Eu site, Eu(2) is bonded in a distorted T-shaped geometry to three equivalent Au(1) atoms. There are two shorter (3.15 Å) and one longer (3.22 Å) Eu(2)-Au(1) bond length. Au(1) is bonded in a 6-coordinate geometry to one Eu(1), two equivalent Eu(3), and three equivalent Eu(2) atoms.