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PrGa crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Pr is bonded in a 7-coordinate geometry to seven equivalent Ga atoms. There are a spread of Pr–Ga bond distances ranging from 3.19–3.31 Å. Ga is bonded in a 9-coordinate geometry to seven equivalent Pr and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.64 Å.
Pr3Ga is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded to eight equivalent Pr and four equivalent Ga atoms to form distorted PrPr8Ga4 cuboctahedra that share corners with twelve equivalent PrPr8Ga4 cuboctahedra, edges with eight equivalent GaPr12 cuboctahedra, edges with sixteen equivalent PrPr8Ga4 cuboctahedra, faces with four equivalent GaPr12 cuboctahedra, and faces with fourteen equivalent PrPr8Ga4 cuboctahedra. All Pr–Pr bond lengths are 3.47 Å. All Pr–Ga bond lengths are 3.47 Å. Ga is bonded to twelve equivalent Pr atoms to form GaPr12 cuboctahedra that share corners with twelve equivalent GaPr12 cuboctahedra, edges with twenty-four equivalent PrPr8Ga4 cuboctahedra, faces with six equivalent GaPr12 cuboctahedra, and faces with twelve equivalent PrPr8Ga4 cuboctahedra.
Pr2Ga is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Pr sites. In the first Pr site, Pr is bonded in a 4-coordinate geometry to five equivalent Ga atoms. There are a spread of Pr–Ga bond distances ranging from 3.20–3.72 Å. In the second Pr site, Pr is bonded in a 5-coordinate geometry to five equivalent Ga atoms. There are a spread of Pr–Ga bond distances ranging from 3.23–3.49 Å. Ga is bonded in a 10-coordinate geometry to ten Pr atoms.
PrGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Pr is bonded to twelve equivalent Ga atoms to form a mixture of edge and face-sharing PrGa12 cuboctahedra. All Pr–Ga bond lengths are 3.30 Å. Ga is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.48 Å.
PrGa3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded to twelve equivalent Ga atoms to form a mixture of distorted face and corner-sharing PrGa12 cuboctahedra. There are six shorter (3.16 Å) and six longer (3.27 Å) Pr–Ga bond lengths. Ga is bonded in a 10-coordinate geometry to four equivalent Pr and six equivalent Ga atoms. There are two shorter (2.78 Å) and four longer (2.82 Å) Ga–Ga bond lengths.