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SrGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sr is bonded to twelve equivalent Ga atoms to form a mixture of edge and face-sharing SrGa12 cuboctahedra. All Sr–Ga bond lengths are 3.49 Å. Ga is bonded in a 9-coordinate geometry to six equivalent Sr and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.52 Å.
SrGa crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are four inequivalent Sr sites. In the first Sr site, Sr is bonded in a 6-coordinate geometry to six Ga atoms. There are a spread of Sr–Ga bond distances ranging from 3.28–3.68 Å. In the second Sr site, Sr is bonded in a 7-coordinate geometry to seven Ga atoms. There are a spread of Sr–Ga bond distances ranging from 3.31–3.58 Å. In the third Sr site, Sr is bonded in a 6-coordinate geometry to six Ga atoms. There are three shorter (3.38 Å) and three longer (3.42 Å) Sr–Ga bond lengths. In the fourth Sr site, Sr is bonded in a 1-coordinate geometry to seven Ga atoms. There are a spread of Sr–Ga bond distances ranging from 3.09–3.51 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to six Sr and three Ga atoms. There are two shorter (2.72 Å) and one longer (2.76 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 9-coordinate geometry to seven Sr and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.82 Å. In the third Ga site, Ga is bonded in a 7-coordinate geometry to seven Sr atoms. In the fourth Ga site, Ga is bonded in a 9-coordinate geometry to six Sr and three equivalent Ga atoms.