Eu3As4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), and one As(2) atom. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one As(1), and one As(2) atom.
Eu3As4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. There are two shorter (3.09 Å) and two longer (3.18 Å) Eu(1)-As(1) bond lengths. There are two shorter (3.17 Å) and two longer (3.20 Å) Eu(1)-As(2) bond lengths. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. There are a spread of Eu(2)-As(1) bond distances ranging from 3.12-3.17 Å. There are a spread of Eu(2)-As(2) bond distances ranging from 3.11-3.21 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), and one As(2) atom. The As(1)-As(2) bond length is 2.49 Å. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one As(1), and one As(2) atom. The As(2)-As(2) bond length is 2.62 Å.