Sr5As3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted T-shaped geometry to three equivalent As(1) atoms. In the second Sr site, Sr(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted corner, edge, and face-sharing SrAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. As(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1) and four equivalent Sr(2) atoms.
Sr5As3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted T-shaped geometry to three equivalent As(1) atoms. There are two shorter (3.10 Å) and one longer (3.19 Å) Sr(1)-As(1) bond length. In the second Sr site, Sr(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted corner, edge, and face-sharing SrAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. All Sr(2)-As(1) bond lengths are 3.32 Å. As(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1) and four equivalent Sr(2) atoms.