EuAs crystallizes in the hexagonal P-62m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(1) and four equivalent As(2) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent As(1) and four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(2) is bonded to three equivalent Eu(1) and three equivalent Eu(2) atoms to form a mixture of distorted edge, corner, and face-sharing AsEu6 octahedra. The corner-sharing octahedral tilt angles range from 48-54°. In the second As site, As(1) is bonded in a 7-coordinate geometry to three equivalent Eu(1), three equivalent Eu(2), and one As(1) atom.
EuAs crystallizes in the hexagonal P-62m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(1) and four equivalent As(2) atoms. Both Eu(1)-As(1) bond lengths are 3.08 Å. All Eu(1)-As(2) bond lengths are 3.11 Å. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent As(1) and four equivalent As(2) atoms. Both Eu(2)-As(1) bond lengths are 3.10 Å. All Eu(2)-As(2) bond lengths are 3.06 Å. There are two inequivalent As sites. In the first As site, As(2) is bonded to three equivalent Eu(1) and three equivalent Eu(2) atoms to form a mixture of distorted edge, corner, and face-sharing AsEu6 octahedra. The corner-sharing octahedral tilt angles range from 48-54°. In the second As site, As(1) is bonded in a 7-coordinate geometry to three equivalent Eu(1), three equivalent Eu(2), and one As(1) atom. The As(1)-As(1) bond length is 2.83 Å.