Materials Data on Pm3Eu by Materials Project
EuPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded to twelve Pm atoms to form EuPm12 cuboctahedra that share corners with six equivalent EuPm12 cuboctahedra, corners with twelve PmPm8Eu4 cuboctahedra, edges with eighteen PmPm8Eu4 cuboctahedra, faces with eight equivalent EuPm12 cuboctahedra, and faces with twelve PmPm8Eu4 cuboctahedra. All Eu–Pm bond lengths are 3.71 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Eu and eight Pm atoms to form PmPm8Eu4 cuboctahedra that share corners with four equivalent EuPm12 cuboctahedra, corners with fourteen PmPm8Eu4 cuboctahedra, edges with six equivalent EuPm12 cuboctahedra, edges with twelve PmPm8Eu4 cuboctahedra, faces with four equivalent EuPm12 cuboctahedra, and faces with sixteen PmPm8Eu4 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.64–3.78 Å. In the second Pm site, Pm is bonded to four equivalent Eu and eight equivalent Pm atoms to form PmPm8Eu4 cuboctahedra that share corners with four equivalent EuPm12 cuboctahedra, corners with fourteen PmPm8Eu4 cuboctahedra, edges with six equivalent EuPm12 cuboctahedra, edges with twelve equivalent PmPm8Eu4 cuboctahedra, faces with four equivalent EuPm12 cuboctahedra, and faces with sixteen PmPm8Eu4 cuboctahedra.