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PaSi3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pa4+ is bonded to twelve equivalent Si+1.33- atoms to form a mixture of face and corner-sharing PaSi12 cuboctahedra. All Pa–Si bond lengths are 2.91 Å. Si+1.33- is bonded in a distorted square co-planar geometry to four equivalent Pa4+ atoms.
PaSi3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pa4+ is bonded to twelve equivalent Si+1.33- atoms to form a mixture of corner and face-sharing PaSi12 cuboctahedra. There are six shorter (2.96 Å) and six longer (2.98 Å) Pa–Si bond lengths. Si+1.33- is bonded in a 10-coordinate geometry to four equivalent Pa4+ and six equivalent Si+1.33- atoms. There are two shorter (2.55 Å) and four longer (2.69 Å) Si–Si bond lengths.