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Cr3Ga crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. Cr is bonded in a 6-coordinate geometry to two equivalent Cr and four equivalent Ga atoms. Both Cr–Cr bond lengths are 2.30 Å. All Cr–Ga bond lengths are 2.57 Å. Ga is bonded to twelve equivalent Cr atoms to form a mixture of face and edge-sharing GaCr12 cuboctahedra.
Cr3Ga4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are four inequivalent Cr sites. In the first Cr site, Cr is bonded in a cuboctahedral geometry to four equivalent Cr and eight Ga atoms. All Cr–Cr bond lengths are 2.53 Å. There are a spread of Cr–Ga bond distances ranging from 2.65–2.79 Å. In the second Cr site, Cr is bonded in a 7-coordinate geometry to one Cr and seven Ga atoms. The Cr–Cr bond length is 2.65 Å. There are a spread of Cr–Ga bond distances ranging from 2.49–2.53 Å. In the third Cr site, Cr is bonded in a 11-coordinate geometry to three Cr and eight Ga atoms. Both Cr–Cr bond lengths are 2.43 Å. There are a spread of Cr–Ga bond distances ranging from 2.55–2.80 Å. In the fourth Cr site, Cr is bonded in a 9-coordinate geometry to two Cr and seven Ga atoms. There are a spread of Cr–Ga bond distances ranging from 2.52–2.64 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 5-coordinate geometry to six Cr atoms. In the second Ga site, Ga is bonded in a 10-coordinate geometry to five Cr and five Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.74–2.93 Å. In the third Ga site, Ga is bonded in a 6-coordinate geometry to six Cr and one Ga atom. In the fourth Ga site, Ga is bonded in a 6-coordinate geometry to five Cr and two Ga atoms. The Ga–Ga bond length is 2.53 Å.
CrGa4 crystallizes in the cubic Im-3m space group. The structure is three-dimensional. Cr is bonded in a body-centered cubic geometry to eight equivalent Ga atoms. All Cr–Ga bond lengths are 2.46 Å. Ga is bonded in a distorted linear geometry to two equivalent Cr and six equivalent Ga atoms. All Ga–Ga bond lengths are 2.84 Å.