Materials Data on KPm3 by Materials Project
KPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. K is bonded to twelve Pm atoms to form KPm12 cuboctahedra that share corners with four equivalent KPm12 cuboctahedra, corners with eight equivalent PmK4Pm8 cuboctahedra, edges with eight equivalent KPm12 cuboctahedra, edges with sixteen equivalent PmK4Pm8 cuboctahedra, faces with four equivalent KPm12 cuboctahedra, and faces with fourteen PmK4Pm8 cuboctahedra. There are four shorter (3.72 Å) and eight longer (3.81 Å) K–Pm bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent K and eight Pm atoms to form PmK4Pm8 cuboctahedra that share corners with twelve equivalent PmK4Pm8 cuboctahedra, edges with eight equivalent KPm12 cuboctahedra, edges with sixteen PmK4Pm8 cuboctahedra, faces with four equivalent KPm12 cuboctahedra, and faces with fourteen PmK4Pm8 cuboctahedra. There are four shorter (3.72 Å) and four longer (3.81 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded to four equivalent K and eight equivalent Pm atoms to form distorted PmK4Pm8 cuboctahedra that share corners with four equivalent PmK4Pm8 cuboctahedra, corners with eight equivalent KPm12 cuboctahedra, edges with twenty-four PmK4Pm8 cuboctahedra, faces with six equivalent KPm12 cuboctahedra, and faces with twelve PmK4Pm8 cuboctahedra.