ThPt3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Th(1) is bonded to twelve Pt(1,1) atoms to form ThPt12 cuboctahedra that share corners with six equivalent Th(1)Pt12 cuboctahedra; corners with twelve equivalent Pt(1)Th4Pt8 cuboctahedra; edges with eighteen Pt(1,1)Th4Pt8 cuboctahedra; faces with eight equivalent Th(1)Pt12 cuboctahedra; and faces with twelve Pt(1,1)Th4Pt8 cuboctahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Th(1) and eight Pt(1,1) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Th(1)Pt12 cuboctahedra; corners with fourteen Pt(1,1)Th4Pt8 cuboctahedra; edges with six equivalent Th(1)Pt12 cuboctahedra; edges with twelve Pt(1,1)Th4Pt8 cuboctahedra; faces with four equivalent Th(1)Pt12 cuboctahedra; and faces with sixteen Pt(1,1)Th4Pt8 cuboctahedra. In the second Pt site, Pt(1) is bonded to four equivalent Th(1) and eight equivalent Pt(1) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Th(1)Pt12 cuboctahedra; corners with fourteen Pt(1,1)Th4Pt8 cuboctahedra; edges with six equivalent Th(1)Pt12 cuboctahedra; edges with twelve equivalent Pt(1)Th4Pt8 cuboctahedra; faces with four equivalent Th(1)Pt12 cuboctahedra; and faces with sixteen Pt(1,1)Th4Pt8 cuboctahedra.
ThPt3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Th(1) is bonded to twelve Pt(1,1) atoms to form ThPt12 cuboctahedra that share corners with six equivalent Th(1)Pt12 cuboctahedra; corners with twelve equivalent Pt(1)Th4Pt8 cuboctahedra; edges with eighteen Pt(1,1)Th4Pt8 cuboctahedra; faces with eight equivalent Th(1)Pt12 cuboctahedra; and faces with twelve Pt(1,1)Th4Pt8 cuboctahedra. There are six shorter (2.95 Å) and six longer (3.07 Å) Th(1)-Pt(1,1) bond lengths. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Th(1) and eight Pt(1,1) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Th(1)Pt12 cuboctahedra; corners with fourteen Pt(1,1)Th4Pt8 cuboctahedra; edges with six equivalent Th(1)Pt12 cuboctahedra; edges with twelve Pt(1,1)Th4Pt8 cuboctahedra; faces with four equivalent Th(1)Pt12 cuboctahedra; and faces with sixteen Pt(1,1)Th4Pt8 cuboctahedra. There are a spread of Pt(1)-Pt(1,1) bond distances ranging from 2.83-3.07 Å. In the second Pt site, Pt(1) is bonded to four equivalent Th(1) and eight equivalent Pt(1) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Th(1)Pt12 cuboctahedra; corners with fourteen Pt(1,1)Th4Pt8 cuboctahedra; edges with six equivalent Th(1)Pt12 cuboctahedra; edges with twelve equivalent Pt(1)Th4Pt8 cuboctahedra; faces with four equivalent Th(1)Pt12 cuboctahedra; and faces with sixteen Pt(1,1)Th4Pt8 cuboctahedra.