BaGa2Se4 crystallizes in the orthorhombic Cccm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. Ga(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form edge-sharing GaSe4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Ga(1) atoms. In the second Se site, Se(2) is bonded to two equivalent Ba(1) and two equivalent Ga(1) atoms to form a mixture of edge and corner-sharing SeBa2Ga2 trigonal pyramids.
BaGa2Se4 crystallizes in the orthorhombic Cccm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. All Ba(1)-Se(1) bond lengths are 3.42 Å. All Ba(1)-Se(2) bond lengths are 3.40 Å. Ga(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form edge-sharing GaSe4 tetrahedra. Both Ga(1)-Se(1) bond lengths are 2.43 Å. There is one shorter (2.40 Å) and one longer (2.45 Å) Ga(1)-Se(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Ga(1) atoms. In the second Se site, Se(2) is bonded to two equivalent Ba(1) and two equivalent Ga(1) atoms to form a mixture of edge and corner-sharing SeBa2Ga2 trigonal pyramids.