Pt3Pd is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pd(1) atoms to form PtPd4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Pd4Pt8 cuboctahedra, edges with eight equivalent Pt(1)Pd4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with eight equivalent Pd(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Pd4Pt8 cuboctahedra, faces with four equivalent Pd(1)Pt12 cuboctahedra, and faces with ten equivalent Pt(1)Pd4Pt8 cuboctahedra. In the second Pt site, Pt(2) is bonded to eight equivalent Pt(1) and four equivalent Pd(1) atoms to form PtPd4Pt8 cuboctahedra that share corners with four equivalent Pt(2)Pd4Pt8 cuboctahedra, corners with eight equivalent Pd(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Pd4Pt8 cuboctahedra, faces with four equivalent Pt(2)Pd4Pt8 cuboctahedra, faces with six equivalent Pd(1)Pt12 cuboctahedra, and faces with eight equivalent Pt(1)Pd4Pt8 cuboctahedra. Pd(1) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form PdPt12 cuboctahedra that share corners with four equivalent Pd(1)Pt12 cuboctahedra, corners with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with eight equivalent Pd(1)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Pd4Pt8 cuboctahedra, faces with four equivalent Pd(1)Pt12 cuboctahedra, faces with six equivalent Pt(2)Pd4Pt8 cuboctahedra, and faces with eight equivalent Pt(1)Pd4Pt8 cuboctahedra.
Pt3Pd is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pd(1) atoms to form PtPd4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Pd4Pt8 cuboctahedra, edges with eight equivalent Pt(1)Pd4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with eight equivalent Pd(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Pd4Pt8 cuboctahedra, faces with four equivalent Pd(1)Pt12 cuboctahedra, and faces with ten equivalent Pt(1)Pd4Pt8 cuboctahedra. All Pt(1)-Pt(1) bond lengths are 2.79 Å. All Pt(1)-Pt(2) bond lengths are 2.78 Å. All Pt(1)-Pd(1) bond lengths are 2.78 Å. In the second Pt site, Pt(2) is bonded to eight equivalent Pt(1) and four equivalent Pd(1) atoms to form PtPd4Pt8 cuboctahedra that share corners with four equivalent Pt(2)Pd4Pt8 cuboctahedra, corners with eight equivalent Pd(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Pd4Pt8 cuboctahedra, faces with four equivalent Pt(2)Pd4Pt8 cuboctahedra, faces with six equivalent Pd(1)Pt12 cuboctahedra, and faces with eight equivalent Pt(1)Pd4Pt8 cuboctahedra. All Pt(2)-Pd(1) bond lengths are 2.79 Å. Pd(1) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form PdPt12 cuboctahedra that share corners with four equivalent Pd(1)Pt12 cuboctahedra, corners with eight equivalent Pt(2)Pd4Pt8 cuboctahedra, edges with eight equivalent Pd(1)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Pd4Pt8 cuboctahedra, faces with four equivalent Pd(1)Pt12 cuboctahedra, faces with six equivalent Pt(2)Pd4Pt8 cuboctahedra, and faces with eight equivalent Pt(1)Pd4Pt8 cuboctahedra.