Materials Data on CuPb3 by Materials Project
CuPb3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Cu is bonded to twelve Pb atoms to form CuPb12 cuboctahedra that share corners with four equivalent CuPb12 cuboctahedra, corners with eight equivalent PbCu4Pb8 cuboctahedra, edges with eight equivalent CuPb12 cuboctahedra, edges with sixteen equivalent PbCu4Pb8 cuboctahedra, faces with four equivalent CuPb12 cuboctahedra, and faces with fourteen PbCu4Pb8 cuboctahedra. There are eight shorter (3.33 Å) and four longer (3.40 Å) Cu–Pb bond lengths. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded to four equivalent Cu and eight Pb atoms to form distorted PbCu4Pb8 cuboctahedra that share corners with twelve equivalent PbCu4Pb8 cuboctahedra, edges with eight equivalent CuPb12 cuboctahedra, edges with sixteen PbCu4Pb8 cuboctahedra, faces with four equivalent CuPb12 cuboctahedra, and faces with fourteen PbCu4Pb8 cuboctahedra. There are four shorter (3.33 Å) and four longer (3.40 Å) Pb–Pb bond lengths. In the second Pb site, Pb is bonded to four equivalent Cu and eight equivalent Pb atoms to form PbCu4Pb8 cuboctahedra that share corners with four equivalent PbCu4Pb8 cuboctahedra, corners with eight equivalent CuPb12 cuboctahedra, edges with twenty-four PbCu4Pb8 cuboctahedra, faces with six equivalent CuPb12 cuboctahedra, and faces with twelve PbCu4Pb8 cuboctahedra.