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BAs is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. B3+ is bonded to four equivalent As3- atoms to form corner-sharing BAs4 tetrahedra. All B–As bond lengths are 2.09 Å. As3- is bonded to four equivalent B3+ atoms to form corner-sharing AsB4 tetrahedra.
B6As is T-50 Boron-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent B sites. In the first B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.78–1.91 Å. In the second B site, B is bonded in a 6-coordinate geometry to five B and one As atom. Both B–B bond lengths are 1.73 Å. The B–As bond length is 2.01 Å. As is bonded in a distorted tetrahedral geometry to three equivalent B and one As atom. The As–As bond length is 2.41 Å.
BAs is Wurtzite structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. B3+ is bonded to four equivalent As3- atoms to form corner-sharing BAs4 tetrahedra. There are three shorter (2.08 Å) and one longer (2.10 Å) B–As bond lengths. As3- is bonded to four equivalent B3+ atoms to form corner-sharing AsB4 tetrahedra.