CaPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to twelve Pm(1,1) atoms to form CaPm12 cuboctahedra that share corners with six equivalent Ca(1)Pm12 cuboctahedra; corners with twelve Pm(1,1)Ca4Pm8 cuboctahedra; edges with eighteen Pm(1,1)Ca4Pm8 cuboctahedra; faces with eight equivalent Ca(1)Pm12 cuboctahedra; and faces with twelve Pm(1,1)Ca4Pm8 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Ca(1) and eight Pm(1,1) atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent Ca(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Ca4Pm8 cuboctahedra; edges with six equivalent Ca(1)Pm12 cuboctahedra; edges with twelve Pm(1,1)Ca4Pm8 cuboctahedra; faces with four equivalent Ca(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Ca4Pm8 cuboctahedra. In the second Pm site, Pm(1) is bonded to four equivalent Ca(1) and eight equivalent Pm(1) atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent Ca(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Ca4Pm8 cuboctahedra; edges with six equivalent Ca(1)Pm12 cuboctahedra; edges with twelve equivalent Pm(1)Ca4Pm8 cuboctahedra; faces with four equivalent Ca(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Ca4Pm8 cuboctahedra.
CaPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to twelve Pm(1,1) atoms to form CaPm12 cuboctahedra that share corners with six equivalent Ca(1)Pm12 cuboctahedra; corners with twelve Pm(1,1)Ca4Pm8 cuboctahedra; edges with eighteen Pm(1,1)Ca4Pm8 cuboctahedra; faces with eight equivalent Ca(1)Pm12 cuboctahedra; and faces with twelve Pm(1,1)Ca4Pm8 cuboctahedra. There are six shorter (3.70 Å) and six longer (3.72 Å) Ca(1)-Pm(1,1) bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Ca(1) and eight Pm(1,1) atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent Ca(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Ca4Pm8 cuboctahedra; edges with six equivalent Ca(1)Pm12 cuboctahedra; edges with twelve Pm(1,1)Ca4Pm8 cuboctahedra; faces with four equivalent Ca(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Ca4Pm8 cuboctahedra. There are a spread of Pm(1)-Pm(1,1) bond distances ranging from 3.66-3.77 Å. In the second Pm site, Pm(1) is bonded to four equivalent Ca(1) and eight equivalent Pm(1) atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent Ca(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Ca4Pm8 cuboctahedra; edges with six equivalent Ca(1)Pm12 cuboctahedra; edges with twelve equivalent Pm(1)Ca4Pm8 cuboctahedra; faces with four equivalent Ca(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Ca4Pm8 cuboctahedra.