Sr3Pa is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Sr(1) is bonded to eight equivalent Sr(1) and four equivalent Pa(1) atoms to form distorted SrSr8Pa4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Pa4 cuboctahedra, edges with eight equivalent Pa(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Pa4 cuboctahedra, faces with four equivalent Pa(1)Sr12 cuboctahedra, and faces with fourteen equivalent Sr(1)Sr8Pa4 cuboctahedra. Pa(1) is bonded to twelve equivalent Sr(1) atoms to form PaSr12 cuboctahedra that share corners with twelve equivalent Pa(1)Sr12 cuboctahedra, edges with twenty-four equivalent Sr(1)Sr8Pa4 cuboctahedra, faces with six equivalent Pa(1)Sr12 cuboctahedra, and faces with twelve equivalent Sr(1)Sr8Pa4 cuboctahedra.
Sr3Pa is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Sr(1) is bonded to eight equivalent Sr(1) and four equivalent Pa(1) atoms to form distorted SrSr8Pa4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Pa4 cuboctahedra, edges with eight equivalent Pa(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Pa4 cuboctahedra, faces with four equivalent Pa(1)Sr12 cuboctahedra, and faces with fourteen equivalent Sr(1)Sr8Pa4 cuboctahedra. All Sr(1)-Sr(1) bond lengths are 3.99 Å. All Sr(1)-Pa(1) bond lengths are 3.99 Å. Pa(1) is bonded to twelve equivalent Sr(1) atoms to form PaSr12 cuboctahedra that share corners with twelve equivalent Pa(1)Sr12 cuboctahedra, edges with twenty-four equivalent Sr(1)Sr8Pa4 cuboctahedra, faces with six equivalent Pa(1)Sr12 cuboctahedra, and faces with twelve equivalent Sr(1)Sr8Pa4 cuboctahedra.