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SrSi2 crystallizes in the cubic P4_132 space group. The structure is three-dimensional. Sr is bonded in a distorted body-centered cubic geometry to eight equivalent Si atoms. There are six shorter (3.27 Å) and two longer (3.38 Å) Sr–Si bond lengths. Si is bonded in a 7-coordinate geometry to four equivalent Sr and three equivalent Si atoms. All Si–Si bond lengths are 2.40 Å.
SrSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Sr is bonded to twelve Si atoms to form a mixture of face and edge-sharing SrSi12 cuboctahedra. There are four shorter (3.20 Å) and eight longer (3.36 Å) Sr–Si bond lengths. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to six equivalent Sr and three equivalent Si atoms. There are one shorter (2.33 Å) and two longer (2.50 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 9-coordinate geometry to six equivalent Sr and three Si atoms. There are one shorter (2.33 Å) and two longer (2.50 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 9-coordinate geometry to six equivalent Sr and three Si atoms. There are two shorter (3.20 Å) and four longer (3.36 Å) Si–Sr bond lengths. Both Si–Si bond lengths are 2.50 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to six equivalent Sr and three Si atoms. There are two shorter (3.20 Å) and four longer (3.36 Å) Si–Sr bond lengths. The Si–Si bond length is 2.33 Å.
SrSi2 crystallizes in the cubic P4_332 space group. The structure is three-dimensional. Sr is bonded in a distorted body-centered cubic geometry to eight equivalent Si atoms. There are six shorter (3.27 Å) and two longer (3.39 Å) Sr–Si bond lengths. Si is bonded in a 7-coordinate geometry to four equivalent Sr and three equivalent Si atoms. All Si–Si bond lengths are 2.40 Å.