Sr2Ga3Al is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to three equivalent Ga(1), three equivalent Ga(2), three equivalent Ga(3), and three equivalent Al(1) atoms to form a mixture of face and edge-sharing SrAl3Ga9 cuboctahedra. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Ga(3) atoms. In the second Ga site, Ga(2) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Al(1) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Ga(1) atoms. Al(1) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Ga(2) atoms.
Sr2Ga3Al is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to three equivalent Ga(1), three equivalent Ga(2), three equivalent Ga(3), and three equivalent Al(1) atoms to form a mixture of face and edge-sharing SrAl3Ga9 cuboctahedra. All Sr(1)-Ga(1) bond lengths are 3.47 Å. All Sr(1)-Ga(2) bond lengths are 3.50 Å. All Sr(1)-Ga(3) bond lengths are 3.47 Å. All Sr(1)-Al(1) bond lengths are 3.50 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Ga(3) atoms. All Ga(1)-Ga(3) bond lengths are 2.51 Å. In the second Ga site, Ga(2) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Al(1) atoms. All Ga(2)-Al(1) bond lengths are 2.51 Å. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Ga(1) atoms. Al(1) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Ga(2) atoms.