Ba5As3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted T-shaped geometry to three equivalent As(1) atoms. In the second Ba site, Ba(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted corner, edge, and face-sharing BaAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. As(1) is bonded in a 7-coordinate geometry to three equivalent Ba(1) and four equivalent Ba(2) atoms.
Ba5As3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted T-shaped geometry to three equivalent As(1) atoms. There are two shorter (3.30 Å) and one longer (3.34 Å) Ba(1)-As(1) bond length. In the second Ba site, Ba(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted corner, edge, and face-sharing BaAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. All Ba(2)-As(1) bond lengths are 3.52 Å. As(1) is bonded in a 7-coordinate geometry to three equivalent Ba(1) and four equivalent Ba(2) atoms.